Last time we had to pay for it all up front - it was Magnet and they accepted a credit card - which gave us a little comfort against them going bust - but the kitchen was badly fitted by them and it took them a year to sort it out, I never really felt they were too bothered about the really bad job they did and part of that was that they had the money already and all I could do was plead - but that's a whole other thread. 
So I'm not very keen on paying for the whole kitchen upfront again - but is this what's expected - am I asking for something I'm never going to get?
Did you pay for your kitchen in stages?