Happy to announce this morning all is normal again.

Briefly I spoke to o2 yesterday evening following advice on here,
And although after explaining problem I was put on hold/cut off,
I'm guessing someone there picked it up and resolved that issue.

First thing this morning the account had returned to desktop but then browser had vanished....

An hour later, that too appeared.

Thank you for suggestions,
An invaluable source of info I've been here some time now, and keep coming back

Regards
Richard