Thanks for that Terpe,

I am aware that I will have no bearing on her visa application to visit her family in Switzerland. I was wondering about when she comes to apply for a fiancee visa to the UK. I have looked at the UKBA site and can find no reference to anything from the sponsor side other than the normal - financial, records of contact, photos together, accommodation etc, but want to be certain.
Thanks also for the link to the OISC - I will have a look there and try to find an adviser.

Thanks again.