I see. I didnt know but kind of surmised that it would be something like that. Thanks. So evidently one would have to go back to square one again under such cirumstances........so a good reason to get it right the first time.
The other thing that came to light was that she (her friend) was interviewed by the UK embassy in London at some stage and was asked what side of the bed her husband slept on.
Anyhow, thanks. I can explain that to my Mrs so she doesn't think she has to re-apply as a matter of routine.