There's a lot that's fuzzy in the early years where they met as teenagers, then got married at 24 / 26, then sold a house in Staffordshire (what were they earning and how, to be able to buy a house at that point?) before they moved to Wales. While that's before they entered the public eye, it does suggest they may have had a leg up with house buying and or jobs in the family business.
In TWS SalRay says they bought a house before they were married- so presumably around 1985. Neither had been to uni and at least she was living at home so I imagine they saved up a deposit and got a mortgage; but houses were a more achievable price back then. If they’re both quite handy they could conceivably have bought a doer-upper and made a decent profit when they sold it.