update.... fitted a set of origin wheels 5" with 650's on. they came as a spare set. tyres are a bit perished and rims a bit suspect... Took it for a spin up the lanes and the gearing already feels better, with the tread pattern it sounds like a landcover!!!
thinking more that i will go 235/85 on defender rims - was thinking wolf but i really want the standard look and i can't afford deep dish...