I was never asked about evidence of Wedding plans when I applied for my fiancee visa, nor coming through Immigration. I showed passport with visa and my X-ray.
My fiancee was told that it is now actually illegal for UK Registry Offices to provide ceremony bookings until both parties are present and Embassies are advised of this. He got this in writing from his local registry, so I printed this off to show Immigration if they asked for evidence of wedding arrangements.
It shows we made the attempt to book
After all, it seems a bit risky to book/ pay towards reception venues or catering if the ceremony date is not set, and so it is difficult to see how they Immigration can ask for such evidence at the airport...
Good Luck
