The problem is that any appreciation in value will attract tax at sale. Buy for £5m, sell for £8m and there will be tax to pay on the £3m profit. If this was

The problem is that any appreciation in value will attract tax at sale. Buy for £5m, sell for £8m and there will be tax to pay on the £3m profit. If this was your only home, you wouldn't have to pay any tax. On the flip side, if you have multiple properties it makes sense. You can also write off any maintenance, refurbishments, etc as tax deductible expenses.