In house or consultancy?
There’s product / industrial design businesses across the UK. If you want a consultancy gig have a look at the design directory: http://www.designdirectory.co.uk/ But it’s worth noting that the majority are small companies with only a few staff so most won’t be hiring.
There are a limited number of big manufacturers with design/engineering centres in the UK. You may need to be open to travel to get the best career opportunity, even if it’s not in the most exciting part of the country.