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Bednobs, it's for him to rent out, although he is over 60 so could use it if he wanted to. He was thinking in terms of charging it on the rent and then paying it from there himself from that, but as mentioned conflicting views from the estate agents made us wonder.
We understand that only certain people can live there, which is why he is interested. He feels older people will respect the property and the tuenover of tenanta is likely to be lower. he's not looking to charge excessive rent, just in line with the market.
He is already retired (early) so it's an investment for him to supplement his current occupational pension which is only £280 a month-he has another 5 years before he gets his state pension. Obviously any tax liability will be declared but he just wants to make sure it's all above board. Thanks to everyone for their answers