6 months block is good thats what i did. be very careful as I had pikeys move in and started to deal drugs and grow the bloody stuff in the house. Make sure the agents do proper checks as they said they had but didn`t. Ended up police kicking front door in just before xmas last year and me out of pocket and an on going court case at the mo. It was surpose to be a 60 yr old women living there but she moved her son in who was known to the police and had no intension of living there herself. And i had no rights trying to kick them out had to wait the whole 6 months before i got them out. I know it was a bad experence and it doesnt happen very often but be careful. Also keep track of every thing that is paid and in the house when you rent it. Tescos does a renting package which has everything you need in it for £10. well worth having. I did get someone esle in after and it worked well so just be careful.