I have on rental property, mortgaged, bought three-ish years ago in a dodgy part of Kent where the yield /return on my money is good.
As PP said, if you get stressed out by household repairs and breakdowns, think twice. I also wouldn't self-manage, at least initially. I did, because I'm a lawyer with an inflated opinion of my abilities, and it backfired. Get an agent, at least to find the tenants if not to fully manage.
Don't buy somewhere miles from where you live, because you'll have a shakier knowledge of the local market and likely know fewer reputable agencies, workmen, key cutters etc.
Don't invest every last cent into the property - there will be unforeseen costs for something at some point, and tenants shouldn't wait around for a new boiler just because your finances are all over the shop.
Check the tax implications carefully.
Check your responsibilities carefully - from verifying tenants' rights to be in the UK through deposit protection, gas certification, carbon monoxide alarms and landlord licensing, there are many.
I don't regret my decision to buy and would buy another in the right circumstances, but any of the above can hamstring you and needs careful consideration.
The ethical consideration / FTB point, is between you and Jesus - you need to decide what you personally are happy with.