There are much better ways to lose all your money. Like gambling, or just throwing it away.
Seriously though, rental returns are running at about 2.8% at the moment, and since you'll get a better rate of return in a decent Building Society account, BTL is about the worst idea in the world right now.
Add to that the fact that house prices have been dropping now for the last 5 months, and are expected to keep falling throughout the remainder of this year, then money invested in BTL today will yield substantial losses over the next 12 months at least.
BTL is yesterdays news, and all the savvy BTL'ers are exitting like rats from a sinking ship.
As the adage goes "prices started heading south the moment the pool fo greater fools dried up". Are you one oif the "greater fools"?