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Thanks all for the good wishes.
ironically, it seems we might be getting over it now.
My wife has had a bad chest infection, and I have had a serious tooth cavity abcess so we put our respective lethargy and aches down to that, but decided to test any way, and hey presto.
We both feel better than we did a week ago, so fingers crossed, it's on the way out. We have kept away from everyone, and been nowhere, so hopefully we have not infected anyone else.
As to where we got it - who knows?
Will let you know how we go.
Stay safe everyone.