TV
The Van's price list is pretty good. You've probably seen that a complete airframe kit runs from about $18000 for a standard to about $26000 for a quickbuild - good value at the current exchange rate.
Air freight adds about £500 for each sub-kit, so another £1500-£2000 (quick builds are bulky and usually shipped) and VAT on top of course. So about £14-20K so far.
Tools will likely be £1,000-2,000.
After that it's engine, prop, exhaust, instruments/radios, upholstery, paint etc.. This is where the big differences usually occur. 2nd hand engine and basic instruments plus DIY paint might be possible for another £10k. Best of everything may turn that to another £60k. Most people end up somewhere in the middle.