Are there any Wiccan supply stores in Birmingham UK?

Leedle Bogbean, now at Inshops market, Northfield (opposite Aldi) does all sorts of things including herbs, crystals, wands, broomsticks, leatherbound journals, cauldrons, essential oils, green man plaques and books.

It depends on what you wish to purchase. I live near Birmingham and regularly shop in Shared Earth in the town centre, Zen in Brindley Place, Mirrorstone Crystals in Kings Heath, and many others. The easiest place to purchase supplies from however is the internet. See the related link for some other suggestions