There are several shops that specialise in wide fitting shoes. I can just about get away with Clark's wide fit for formal office shoes but find it difficult with anything else. I've been to a place in Kenton (north London) before now and got some casual shoes that were so comfy without there being an inch of empty space in front of my toes I wish I had gone years before. They're worn out now so will be going back soon for more. They have a safety boot section (and a walking boot section) which is not ideal for biking but if you have trouble getting a good fit it may be worth a try.
https://www.widefitshoes.co.uk/men/wide-safety-boots/