An RV is US-experimental, in the UK that would be on a Permit to Fly. To get a PtF you are totally in the hands of how helpful LAA feel, and whether they can be convinced that the aeroplane is built to the standard they require. Given the uncertainties there - I would recommend not even trying.
A good N-reg on a CofA may well be a good investment. But an American homebuilt, no. Keep looking for a good example on the G reg, or build your own.
G