My two faves at the moment are Catepillar Brode Hi Tops and Uvex Motorsport Safety Trainers. With the latter you need to dump the insoles and put some better ones in though.
The trick though is finding somewhere you can actually try stuff on theres a lot of fundamentally bad workwear out there, but if you can find good stuff its great. Anything I’ve had from Catepillar has always been the comfiest footwear I’ve owned and I can happily buy that online now that I’m familiar with their sizing.
Screwfix have a decent range but you’d need to go there on a quiet day to have any hope of getting a set out of the warehouse and on your feet. If you have a branch of Arco locally they usually stock a good range. Otherwise the best place you’ll find work boots / shoes on the high st to actually try on is actually Sports Direct