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Hertfordshire Swimming Rankings — Girls 12 years

The fastest Hertfordshire girls aged 12 years over the last 12 months, taken from the official Swim England (ASA) rankings and ranked by county. Long course and short course times are listed separately, exactly as Swim England publishes them.

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Hertfordshire long course rankings — Girls 12 years

100m Backstroke — Long course (50m)

Hertfordshire Girls 12 years — 100m Backstroke (LC)
#	Swimmer	Club	Time	Date
1	Layla Harley	Watford SC	1:16.84	11/04/26
2	Kira Norman	Bishop Stort	1:18.71	10/05/26
3	Emma Remenyi	Verulam	1:20.20	10/05/26
4	Scarlett Ye	Co St Albans	1:21.12	10/05/26
5	Annabella Carey	Stevenage	1:21.76	10/05/26
6	Charlotte Rich	Stevenage	1:22.38	10/05/26
7	Aurelia Court	Bishop Stort	1:23.96	08/03/26
8	Sophie Macey	Hemel Hemp	1:27.51	22/03/26
9	Annabel Whetton	Harpenden	1:28.23	22/03/26
10	Marielle Hiemstra	Hitchin	1:29.08	22/03/26

Hertfordshire short course rankings — Girls 12 years

50m Freestyle — Short course (25m)

Hertfordshire Girls 12 years — 50m Freestyle (SC)
#	Swimmer	Club	Time	Date
1	Layla Harley	Watford SC	29.86	24/01/26
2	Ashleigh Worth	Cheshunt	30.22	16/05/26
3	Hannah De Waal	Co St Albans	30.43	12/07/26
4	Charlotte Rich	Stevenage	31.07	16/05/26
5	Catherine Hatherly	Hatfield	31.36	24/01/26
6	Annabella Carey	Stevenage	31.37	16/05/26
7	Aurelia Court	Bishop Stort	31.57	31/05/26
8	Mya Valencia	Hoddesdon	31.58	24/01/26
9	Bronwyn Hill	Co St Albans	31.77	12/07/26
10	Zoi Tselou	Rick'worth	31.87	24/01/26

100m Freestyle — Short course (25m)

Hertfordshire Girls 12 years — 100m Freestyle (SC)
#	Swimmer	Club	Time	Date
1	Ashleigh Worth	Cheshunt	1:05.06	18/01/26
2	Layla Harley	Watford SC	1:06.36	14/06/26
3	Mya Valencia	Hoddesdon	1:08.03	04/07/26
4	Charlotte Rich	Stevenage	1:09.20	18/01/26
5	Catherine Hatherly	Hatfield	1:09.99	21/06/26
6	Aurelia Court	Bishop Stort	1:10.10	19/06/26
7	Bronwyn Hill	Co St Albans	1:10.67	21/06/26
8	Annabella Carey	Stevenage	1:11.07	18/01/26
9	Chloe Wimpenny	Cheshunt	1:11.10	21/06/26
10	Emma Todd	Potters Bar	1:11.36	16/05/26

200m Freestyle — Short course (25m)

Hertfordshire Girls 12 years — 200m Freestyle (SC)
#	Swimmer	Club	Time	Date
1	Ashleigh Worth	Cheshunt	2:25.34	24/01/26
2	Catherine Hatherly	Hatfield	2:26.95	15/03/26
3	Layla Harley	Watford SC	2:28.97	08/03/26
4	Charlotte Rich	Stevenage	2:31.33	05/07/26
5	Aurelia Court	Bishop Stort	2:32.11	21/06/26
6	Emma Todd	Potters Bar	2:33.94	24/01/26
7	Chloe Wimpenny	Cheshunt	2:35.73	20/06/26
8	Naomi Muwangi	Bishop Stort	2:36.30	21/06/26
9	Annabel Whetton	Harpenden	2:36.86	08/03/26
10	Scarlett Ye	Co St Albans	2:37.09	24/01/26

800m Freestyle — Short course (25m)

Hertfordshire Girls 12 years — 800m Freestyle (SC)
#	Swimmer	Club	Time	Date
1	Catherine Hatherly	Hatfield	10:58.75	10/01/26
2	Layla Harley	Watford SC	11:08.12	10/01/26
3	Emma Todd	Potters Bar	11:09.41	10/01/26
4	Charlotte Rich	Stevenage	11:20.17	10/01/26
5	Aurelia Court	Bishop Stort	11:35.79	31/05/26
6	Scarlett Ye	Co St Albans	11:38.76	10/01/26
7	Skye Randall	Watford SC	11:51.84	05/11/25
8	Emma Remenyi	Verulam	12:25.67	12/10/25
9	Lucia Carradice	Co St Albans	12:32.97	12/10/25
10	Annabel Whetton	Harpenden	12:36.08	15/11/25

50m Backstroke — Short course (25m)

Hertfordshire Girls 12 years — 50m Backstroke (SC)
#	Swimmer	Club	Time	Date
1	Hannah De Waal	Co St Albans	34.50	12/07/26
2	Aurelia Court	Bishop Stort	34.63	26/06/26
3	Layla Harley	Watford SC	35.44	24/01/26
4	Tsz-Wing Lai	Co St Albans	35.46	12/07/26
5	Ashleigh Worth	Cheshunt	35.58	16/05/26
6	Mya Valencia	Hoddesdon	35.72	13/06/26
7	Annabella Carey	Stevenage	36.03	16/05/26
8	Emma Remenyi	Verulam	36.62	07/06/26
9	Charlotte Rich	Stevenage	36.63	24/01/26
10	Orla Gallen	Verulam	36.73	07/06/26

100m Backstroke — Short course (25m)

Hertfordshire Girls 12 years — 100m Backstroke (SC)
#	Swimmer	Club	Time	Date
1	Layla Harley	Watford SC	1:14.71	13/06/26
2	Ashleigh Worth	Cheshunt	1:15.28	17/01/26
3	Aurelia Court	Bishop Stort	1:16.62	28/06/26
4	Kira Norman	Bishop Stort	1:17.28	20/06/26
5	Scarlett Ye	Co St Albans	1:18.62	05/07/26
6	Orla Gallen	Verulam	1:18.96	21/06/26
7	Charlotte Rich	Stevenage	1:19.34	17/01/26
8	Maanya Singh	Rick'worth	1:20.15	13/06/26
9	Annabella Carey	Stevenage	1:20.40	17/01/26
10	Emma Remenyi	Verulam	1:20.50	14/03/26

200m Backstroke — Short course (25m)

Hertfordshire Girls 12 years — 200m Backstroke (SC)
#	Swimmer	Club	Time	Date
1	Layla Harley	Watford SC	2:35.98	21/06/26
2	Ashleigh Worth	Cheshunt	2:42.22	05/12/25
3	Catherine Hatherly	Hatfield	2:46.87	15/03/26
4	Kira Norman	Bishop Stort	2:47.56	25/01/26
5	Scarlett Ye	Co St Albans	2:47.68	14/06/26
6	Emma Remenyi	Verulam	2:48.81	08/03/26
7	Aurelia Court	Bishop Stort	2:49.39	31/05/26
8	Selena Maria Spaho	Hatfield	2:51.50	15/03/26
9	Imogen Douglas	Co St Albans	2:53.09	21/06/26
10	Sophie Macey	Hemel Hemp	2:53.87	15/03/26

50m Breaststroke — Short course (25m)

Hertfordshire Girls 12 years — 50m Breaststroke (SC)
#	Swimmer	Club	Time	Date
1	Zoi Tselou	Rick'worth	40.08	24/01/26
2	Layla Harley	Watford SC	40.64	07/03/26
3	Sophia Zhou	Co St Albans	40.87	14/06/26
4	Selena Maria Spaho	Hatfield	40.97	21/06/26
5	Orla Gallen	Verulam	41.10	21/06/26
6	Aurelia Court	Bishop Stort	41.13	20/06/26
7	Ashleigh Worth	Cheshunt	41.71	05/10/25
8	Lucia Carradice	Co St Albans	41.74	15/03/26
9	Kira Norman	Bishop Stort	41.93	20/06/26
10	Catherine Hatherly	Hatfield	42.02	21/06/26

50m Butterfly — Short course (25m)

Hertfordshire Girls 12 years — 50m Butterfly (SC)
#	Swimmer	Club	Time	Date
1	Layla Harley	Watford SC	33.15	13/06/26
2	Mya Valencia	Hoddesdon	33.38	13/06/26
3	Hannah De Waal	Co St Albans	33.39	12/07/26
4	Charlotte Rich	Stevenage	34.17	13/06/26
5	Ashleigh Worth	Cheshunt	34.41	12/10/25
6	Kira Norman	Bishop Stort	34.66	28/06/26
7	Naomi Muwangi	Bishop Stort	34.94	28/06/26
8	Aurelia Court	Bishop Stort	35.09	28/06/26
9	Scarlett Ye	Co St Albans	35.10	25/01/26
10	Grace Armitage	Stevenage	35.24	13/06/26

100m Butterfly — Short course (25m)

Hertfordshire Girls 12 years — 100m Butterfly (SC)
#	Swimmer	Club	Time	Date
1	Layla Harley	Watford SC	1:13.21	13/06/26
2	Mya Valencia	Hoddesdon	1:13.52	04/07/26
3	Ashleigh Worth	Cheshunt	1:15.74	17/01/26
4	Naomi Muwangi	Bishop Stort	1:17.93	31/05/26
5	Scarlett Ye	Co St Albans	1:18.50	17/01/26
6	Catherine Hatherly	Hatfield	1:19.90	17/01/26
7	Grace Armitage	Stevenage	1:22.05	11/07/26
8	Charlotte Rich	Stevenage	1:22.67	11/07/26
9	Aurelia Court	Bishop Stort	1:24.60	31/05/26
10	Jemima Mansfield	Hemel Hemp	1:25.24	17/01/26

100m Individual Medley — Short course (25m)

Hertfordshire Girls 12 years — 100m Individual Medley (SC)
#	Swimmer	Club	Time	Date
1	Layla Harley	Watford SC	1:16.23	20/06/26
2	Charlotte Rich	Stevenage	1:16.58	13/06/26
3	Ashleigh Worth	Cheshunt	1:16.95	25/01/26
4	Mya Valencia	Hoddesdon	1:17.48	13/06/26
5	Catherine Hatherly	Hatfield	1:17.66	25/01/26
6	Tsz-Wing Lai	Co St Albans	1:19.31	14/06/26
7	Kira Norman	Bishop Stort	1:19.56	19/06/26
8	Zoi Tselou	Rick'worth	1:20.68	25/01/26
9	Annabella Carey	Stevenage	1:20.79	25/01/26
10	Orla Gallen	Verulam	1:22.03	20/06/26

200m Individual Medley — Short course (25m)

Hertfordshire Girls 12 years — 200m Individual Medley (SC)
#	Swimmer	Club	Time	Date
1	Ashleigh Worth	Cheshunt	2:43.75	22/11/25
2	Layla Harley	Watford SC	2:45.09	21/06/26
3	Catherine Hatherly	Hatfield	2:48.83	21/06/26
4	Charlotte Rich	Stevenage	2:48.88	04/07/26
5	Aurelia Court	Bishop Stort	2:50.40	20/06/26
6	Sophia Zhou	Co St Albans	2:51.38	20/06/26
7	Kira Norman	Bishop Stort	2:52.20	20/06/26
8	Tsz-Wing Lai	Co St Albans	2:53.41	13/06/26
9	Scarlett Ye	Co St Albans	2:53.48	20/06/26
10	Naomi Muwangi	Bishop Stort	2:54.09	20/06/26

400m Individual Medley — Short course (25m)

Hertfordshire Girls 12 years — 400m Individual Medley (SC)
#	Swimmer	Club	Time	Date
1	Ashleigh Worth	Cheshunt	5:48.07	30/11/25
2	Catherine Hatherly	Hatfield	5:50.92	21/06/26
3	Layla Harley	Watford SC	5:52.79	21/06/26
4	Mya Valencia	Hoddesdon	5:55.96	05/07/26
5	Kira Norman	Bishop Stort	6:08.45	28/06/26
6	Aurelia Court	Bishop Stort	6:09.09	28/06/26
7	Sophia Zhou	Co St Albans	6:15.16	05/07/26
8	Scarlett Ye	Co St Albans	6:15.45	18/01/26
9	Tsz-Wing Lai	Co St Albans	6:18.24	18/01/26
10	Yuet Yau	Hatfield	6:23.12	18/01/26

Has this swimmer qualified?

Ranking well in Hertfordshire usually means county qualifying times are within reach. See the full Hertfordshire county qualifying times or check any swimmer against county, regional and national standards in one go.

Other Hertfordshire age groups

Hertfordshire Girls 10 years Hertfordshire Boys 10 years Hertfordshire Girls 11 years Hertfordshire Girls 13 years