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Ah - well that's not too bad if you want IKEA - service locations can be factored in. Cabinet sizes and features can vary between companies too. I specified IKEA because the combined unit sizes would give me max optimisation and hardly any filler pieces. In the end I had to pivot to magnet and tweak layout. Most builders will have an account with howdens also and most of it is pre built and off the shelf but having a good kitchen fitter is really important as to how it all turns out.
Having doors made to suit carcasses will be much more expensive than using off the shelf doors. I looked at plykea etc and ended up with basic bitch matt white.
I'd start with layout and aesthetic first and figure out supply later tho really.
If you can find a builder / fitter you like and trust - ask them where they have accounts. I wanted ikea Metod but builder price matched to magnet. It is not better quality tho. But IKEA plastic legs and plumbing bits are known to be a bit crap and they don’t have a service void behind so often need modification to work with uk plumbing.