By the by, on the question asked up above by myself and
@Mo1959 which I don't think we had an answer to.
Beeb did a bit earlier where they read out viewers' questions - often the best way of getting the answers that matter.
The view of the beeb medical correspondent was that if you got the thing, then yes, you would be protected for quite some time afterwards.
EDIT - it's now on their web guidance:
2. If you recover from coronavirus are you immune? RubyRed on Twitter.
Well, it is too soon to tell. This virus has only been around since the end of December, but from experience with other viruses and coronaviruses you should have antibodies to the virus which will protect you.
With Sars and other coronaviruses we tended not to see reinfection. Now there are some reports from China of people who are released from hospital subsequently testing positive but we're not sure about those tests.
However, the key thing was those people were no longer infectious.
which is good news - particularly that last sentence.