as previously mentioned, lidl do some bike stuff, give it a try
im size 9 work boots, dunno about trainers as ive not had a pair for years, i wear me work boots everywhere i go even on the bike.
its would prefer to go for a snug fitting boot as this would offer more ankle protection in the event of an off, wheras a larger boot would allow the ankle to rotate more within the boot.
go to a bike shop and try a few pairs on to see what you think. could make the difference between a trip to A&E with a limp for a few weeks and walking away with a few bruises