Looked at becoming a landlord several tmes, but as house prices have shot through the roof, there is little margin in it, and 1 twot tennant can ruin the finances for quite some time. Now 25/30 yar ago when you could still buy a big Victorian terrace house for around £50k, that was the time to move into property - 20/20 hindsight is a marvellous thing!
If anyone is still interested in going down this line, I would buy ex-council houses. OK they don't rent for as much, but are generally built out of unbreakable stuff like breeze blocks, and don't cost so much to buy in the first place. I would also be avoiding renting to any tennant on benefits, or would only rent to such people if it was a very cheap property in a lettuced area.