As of today, I can still find stock for b12 100x1ml at the following:
apotheke-marienbrunn.de/vit...
shop.ludwigsapo.de/vitamin-...
fliegende-pillen.de/product...
shop.apotal.de/vitamin-b12-...
All are sending to the UK as far as I can tell (I can add to cart and pay by paypal/amazon with a UK address).