My MIL rents out her bungalow as she now lives with my BIL. There are different Landlord rules in different parts of the UK. The bungalow is in Wales and they now rent via an Agency.
They have been lucky that they have had the same tenant for over five years, who is good with the property. The problem with this is that my MIL struggles with putting up the rent, as the person she rents the bungalow to is a single parent and she feels sorry for her. Becoming a landlord can feel like a more personal investment. (In addition to this she also has a personal attachment to the house as she lived there for 15 years). However this will not be such a difficulty for you and you would be more business-like.
My MIL gets on average around 65% of the rent after paying, tax, agency fees, maintenance, insurance, gas checks, etc. I know this because we complete her tax return to the Inland Revenue. However, she is keen to maintain the property to a high standard.
If you are going to rent it out you might want to consider getting a survey on the house so you have a good idea of likely maintenance.
In saying all this it has not been a bad investment, as property prices have substantially increased over the last five years.
Good luck with your decision.