[Claymores]

IIRC for your 1st passport you'll need to get the back of your photo's signed by a 'designated person'. These can include professionals such as a qualified solicitor or your GP. That bit of the process can be a bit of a nuisance. You'll also have to send off the original of your birth certificate so I hope you/parents know where it is.

No interview.

EDIT - I was wrong to say definitely no interview as I see things have now changed in some circumstances. Take a look at the link I posted below for the full info! It's a good guide and should help answer all your questions