not sure, the way the wind is blowing it might not work out as you want.
Firstly, as a LL myself, there are lots of costs and responsibilities with owning a rental property. I would say about 30-40% of rental income goes on maintenance, costs (new boiler and that kind of fun), gas safe certificates, electrical faults, leakages (if the neighbour upstairs leaves the bath to run).
TBH, it's a not a goldmine and be careful that the rental income exceeds the mortgage costs (so you can weather all the maintenanc issues).
Also, if the price of the property goes up and you decide to sell down the line, there is a whopping 40% of tax on the added value since you bought it.
Also, if/when Labour come to power they may simply requisition it for their own needs, or allowing any tenant to force a sell to them (below market value). At which point you'd pay the above mentioned tax.
Also, everyone on MN will hate you 
For me, I am trapped as selling it means massive tax bill. And keeping it means all kinds of shit when Labour come to power. So a carefree income scheme it is not 