I have been looking at a number of posts on this website and others and estimate that a cnc machine is going to be £1500 plus just for the parts. I have no real desire to build the machine, so I had been looking at commercially marketed machines too.
Welcome to the forum Steve. I would be careful of buying any stuff until you have a design sorted out as that is one of the biggest mistakes people make as the plan will evolve and change over time. Also don't buy any electronic kits and they are never matched or correct.

There are one or two people on the forum that do build bespoke machines and usually to much higher quality than you can get for the same money. Good luck with whichever way you decide to go.