If you plan to build an RV-9A in the UK budget on spending £40k. This will get you a slow build kit, a new O-320 lycoming and a minimal/avionics instrument fit. It will also cover tools, shipping charges and the dreaded VAT

(who says aviation isn't taxed).
If you are prepared to do your own paintwork you might shave £2k off the above figure.
How do I know these figures are correct ?. I built one, it's been flying 12 months now and I still have an ear

to ear

grin

every time I get in it.
The Manchester low level route takes on a whole new aspect at 150kts
Hen Ddraig
Time to spare, go by air.