I use my mum's address for my boring mail, which is fairly limited, marina for erm nothing and parcels delivered to work (waiting for parcels to go south and then up here is a pain). My mum's ace - she sends me a text to tell me what's arrived and I normally just collect it when I eventually visit. If it sounds interesting or important she posts it to work for me
I did try insuring my old car to here and one insurance co refused as it wasn't a "proper" address. Ah well someone else got the business so it wasn't too much of a hardship.
Previous (but one) marina was fine for post so everything went there. In fact I bet I still have some going there