Thank you for the reply.
I have a run of cable here which I will try when new hub arrives. I am using Hub 3, (possibly even 2, eight years old, I replaced an old NTL hub with it) and waiting for either a 4 or a 5 to arrive. I pay for a faster broadband connection than standard.
CityFibre were doing work in the building either last month of December, I do not know if this is related to the problem. When I switched on today and was updating software the connection was cutting out again.
How would I know if I have been hacked for free wifi?