Just wanted to confirm the very important point highlighted by Arthur that for personal appearances the application should be "straightforward".
This means that ALL the supporting evidence is fully compliant with UKBA STATED requirements. Any issues at all that require further checks or validations will involve back-office caseworkers and your application will not be decided on the same day but will be added to the 'regular' processing backlog.
Not a good use of your hard-earned cash.
Just my 2 centavos worth