Thanks, but this doesn't seem to correlate with my problem. We have two email accounts, one for me, the other for Mrs O. The latter has remained functional, mine is still unavailable nearly three weeks later. Each time I call they promise it will be fixed next day, but it never is. The only good news for me is that Virgin Media is about to send out yet another notice of an above-inflation price increase, which entitles users to terminate the contract without penalty.
Meanwhile I am working on moving all my contacts to another email address.