I think the tax changes have all but killed it off.
Stamp Duty 3% more, and reduced tax allowances.
That said a 2 bed semi in West Sussex is advertised at £1,000 a month!
£12,000 a year on a low interest rate mortgage say 3% with prices going up 5% is still a decent yield if you can be bothered dealing with tenants and repairing the damage they leave.