For about a week or so now, the guide or tv listing shows BBC1 London and local new as BBC London.
I am in West Yorkshire and have BBC Yorkshire TV in ABM Providers.

I have tried a reboot of my receiver which worked once, ie restored to correct TV area, then I restored a previous. old, backup, which again worked.
Every time I switch on the receiver, the TV area has changed back to BBC London, and we can't watch our local news.

What has caused this to happen and how do I fix it permanently.

Thanks