A record number of sales took place in March 2016, as investment property buyers tried to beat the Stamp Duty rise from 1st April. The result of this, according to data from the website Rightmove, was an 11.5% rise in rental properties being listed in April[1].
It is believed that there will continue to be further properties listed on the rental market in the forthcoming months whilst the buy to let property investors complete works to their newly purchased property to bring it up to standard to be marketed.
[1] http://www.bbc.co.uk/news/business-36285049