Research by Platinum Property Partners indicates that some landlords aren't taking key running costs into account and are therefore accidentally over-estimating their profits.
Tax can be a minefield at the best of times and with buy-to-let investments there are a lot of areas where tax has to figure in calculations. This article, from This is Money, highlights those areas and suggests ways to cut costs and minimise tax liabilities.
You'd expect most tenants to clear their belongings from a property when the lease ends, and most do. But when they don't it's the odd broken item that you or the agent has to throw away, right? Not in London apparently - one tenant left a Range Rover behind!