Hi, I'm working on Cheap CNC

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I don't know how you come up with a £900 ish price, but just the VFD and the spindle motor costs at least £300 or around that. Add driver electronics, three steppers, a PSU and that's another £300 ish, and you still not even have a single meter cable, motion controller is another £100-150 ish (unless you want to run parallel port in 2017...). I haven't even mentioned any building material yet. A machine that huge demands quite a lot of material for the frame, even if you make it a weak and light one, it will cost more than £300, unless you have some supplier who can give you material for free. What about software? Are you planning on buying one or plan to download/use a pirated Mach3? Buying a Mach3 license costs also about £150 (haven't checked lately, so it can be more), but you can of course buy UCCNC for about £50, assuming you buy their motion controller for another £100... ;) What about the linear rails? Those are pretty expensive as well, even if you buy cheap eBay quality, it will cost you another £300 ish, at least.

Another thing is that chain driven CNC may not be the best when it comes to precision, and also the movements will be very noisy. If you don't want to use direct driven screws than you should at least go for belt drive. Those are much better and also quieter, though I don't know, maybe more expensive as well.

So, my advice is if £900 is the budget limit then don't start, or make a very small one just to learn. For a machine with 900x900 table you must be prepared to spend at least twice that amount, and I think even that is optimistic.

I wish you good luck, regardless what you decide to do.