Not just England, try Scotland and some of its Islands.
Not much chance of Vit D from sunlight for almost half the year.
Penzance 50.1 N London 51.5 N Berwick 55.8 N
Edinburgh 56.0 N Aberdeen 57.1 N Thurso 58.6 N
Kirkwall 59.0 N Lerwick 60.1 N Haroldswick 60.8 N