A survey by Privilege Home Insurance finds that UK homeowners believe they have increased the value of their properties' by 51 billion pounds after being inspired by TV makeover shows. But the key word in that sentence appears to be believe. It looks as if these figures are reached by asking said homeowners for estimates, and even for experts this kind of valuation is a totally inexact science. Top telly-inspired projects are said to include garden water-features. Does a water-feature add value? Call me a snob, but aren't water-features the new gnomes?