I wouldn't touch Wren with a bargepole as their owner is one of the biggest donors to the Conservative party
My other half's colleague recently had his kitchen done by then, she hasn't the heart to tell him! We did actually look in one of their showrooms (purely for ideas) but it all felt very 'American' and a bit like a Currys or something. Very touristy.
Most on here will recommend DIY Kitchens I'm sure. We looked at them but thought the extra outlay for a local independent was worth our time and effort. Not to mention we're having the kitchen walls moved so didn't fancy figuring that all out with DIYK.
Howden's seem to be well-rated and are not stupid money. Besides our designer there disappearing off with COVID and no-one covering her emails (to a clearly shared inbox?
) it was a very pleasant experience. You could also try John Lewis, we had a meeting with them but their ballpark quote was very high, and they didn't have the colour we wanted either.
I would honestly look at a local independent if you have one, or Howden's. My Mum is going with Optiplan, price seems reasonable and she seems happy with the designer/process so far. They have a few branches.