When we used an agency, they managed the let, for a fee. £113 per month plus vat, it was a percentage of the rental income.
I honestly think that letting the agency manage the property is more for the benefit of the tenant than the landlord. Every call out was charged at £44 plus vat, and plus parts, and additional fees if the repair person spent more than an hour, or deemed an electrician or plumber was necessary. Than one of those would be called out, at another fee. The agency took commission on all call outs, so they were making a killing and our rental profit went down.
When we took stock after three years, we had not made any profit at all.
Fair enough if you want to put yourself through it to let the property be lived in and you see it as a pension that you can sell in the future. But then there will be capital gains tax on it, if you have not lived in it for a few years. To avoid that, you will need to move back in and live in it for 6-12 months and prove that it is your primary residence.
It can potentially become a bigger headache than it is worth.
Holiday homes, now, that is a lot more profitable!