The high-end mortgage market has seen "significant growth" over the last few years and has been unaffected by the global credit crunch, according to a major financial investor.
Increased levels of demand in the industry have seen the market become "resilient" and "stable", Investec has stated.
Andrew Arlott, a spokesperson for the company, said the mortgage market was, on the whole, being hit by a tightening of the availability of credit but that the high-end mortgage sector has "historically" been good in such circumstances.
He added: "It`s certainly the most resilient end of the market, I think. In terms of us, it`s business as usual - it hasn`t impacted what our business does at all. You have a feeling across the market that things are tighter in general."
Research from Halifax suggests the number of million pound house sales in the UK has increased nearly three times over in the past five years.