What is the best bakery?

Without any shadow of a doubt whatsoever, Grodzynski's Bakery at 223 Golders Green Road, NW11 9ES. I very much doubt you will find better challah anywhere in Britain and quite possibly the rest of Europe too. There can be no such thing as an unequivocal answer to such a question. If there were no shadow of a doubt, how is it that so many other in the close vicity also sell large quantities of challah ?