My Mum has passed away and i need to spend a week clearing her home. Her phone has been disconnected and i wondered if i could use my mini hub to get broadband while i am staying there? I
No. That is not what the mini hub is for. It is if your broadband developed a fault it is to keep you connected.
Tether your mobile
Do you mean use 4g to create a personal hotspot? I guess that will be my only option.
Yes, or tether via USB.