I just had a kitchen fitted (I am finishing off the electrics, and tiling the splashback for the range atm)
Got lots of quotes, and looked at quite a few. Howdens offered me a 80% discount straight away after visiting my house, Howdens kitchens are very much aimed at making the builders/installers life easier (pre drilled holes for hinges/handles etc) and there installation plans (for the fitter) are very very good, plus if you have any damaged bits they have them in stock and will run them out to you so you don’t have to wait weeks for missing/damaged bits.
However I in the end went with a local kitchen shop, as the quality was much better, there wasn’t all the pre-piloted stuff, which makes the doors look messy and there price was similar. However, the fitters instructions were woeful and it took much much longer to install (which impacts the installation fee)
Most kitchen shops will try to match Howdens as they are the people to beat. However don’t expect as big a discount, as most people understand that Howdens RRP is a joke, so they can take 80% off just for asking.
Also with regard to worktop-express you need to check the worktops very very carefully as it took them three goes to get one to me undamaged, also you need to factor this in to the delivery as if the fitter is waiting for a worktop he/she won’t be happy