It may be that as he has moved leaving his own house unoccupied - provable as he is paying rent - that he will not be required to pay Council Tax. Depending upon the band he is taxed in, he may even be better off. Caveat - it is a little while since I last checked this protocol. If still valid, this would save me £180 per month which for sure would neutralise the problem.
The fact however remains that the system is unfair and should be changed, especially as the same system is hell bent on getting all ranks to live out in future years.