Stereotyping will come into play eg I would expect:
my doctor, pharmacist, accountant to be of Indian origin.
my sparkie, plumber, chippie to be called Dave, Steve, Trevor
any nurse this side of London to be called Precious, Blessings, Darling
but on the other side of London to be called Naimah, Aoife, Eithne
What we do have though is a large rise in Sikh builders, through London and Kent and yes they really do have 'You've tried the cowboys etc ' on their vans, and they work on everyone's houses, not just other Asians.
But this thread is about trades folks, and one of the big Brexit issues was jobs going to foreign nationals. I can only talk about the South, trades on building sites are earning less than they were 25 years ago. It wasn't uncommon to be earning the thick end of £500 a day as a roofer, now they're lucky to get £250-£300 a day. My boy only gets £120 a day as an apprentice stone mason. In my experience most trades get their work through word of mouth and in the pub.
When I had my kitchen replaced, the fitter apologised the tiler was Polish, did I mind? No, so long as the does the job properly and cleans up.