All sounds OK then
BTW I wasn't suggesting you have anything checked prior to the appointment, what I was saying is to be sure ALL your supporting documents are FULLY compliant so that the UKBA do not need their caseworkers to verify any information that you supply.
Anyway sounds like your application is very straight forward and fully compliant so no worries.
It's always a personal choice but IMO money well spent to avoid all that stress and waiting.