I rather think that where one is living must be regarded as one's address.
I have searched on the net but cannot find specific info on this. It does say that a PO box cannot be used for an individual.
I seem to remember that a C/O address can be used if one is resident in UK.
I think the address where Alan is staying could be considered as his address. Of course if he changes address he will need to notify the new address.
