Thanks for that Joe,
I phoned them again yesterday and as on the day before, after many failed calls, I managed to get in to the queue and got through to someone about 15 to 20 minutes later. I told the woman there what I had been told previously and explained to her that the visa expiry dates were in fact different for my wife and step-daughter.
I did manage to get an email address from her because what she told me complicated the matter even more and I didn't want to spend an hour on the phone again today trying to get my query sorted out. The email address I got, for the sake of any of the other members on here who may need to contact them is ukbapublicenquiries@ind.homeoffice.gsi.gov.uk .
What she told me that confused the issue even more was that as well as the visa expiry dates, it depended on the visa "Type" as seen on the visa slip. She said it should say "Dependant" and after checking my step-daughters visa slip I found that it didn't say "Dependant", it actually says "Visa to Join Parent(s)".
Anyway, I have have sent an email with all of the dates and other information to the email address above and I have received a automated reply saying that they aim to deal with all such enquiries within 5 working days, so I suppose I will just have to wait to hear what they have to say.
Cheers,
Iain.
