*UPDATE*
Passport for: Adult (First British passport)
Application Type: New (naturalised)
Method of application: Royal mail recorded signed for
Date of application: 09 October 2015
Received by Passport Office: 12/10/2015 (Peterborough) - checked on Royal Mail tracking site
Date of interview letter: 17/10/2015 (dated 15/10/2015 - received through first class mail)
Date of interview booked: 17/10/2015 (called on the passport appointments mentioned in the letter)
Date of interview: 19/10/2015 (Globe House, London)
Date of SMS received: 20/10/2015
Date of return of documents: 20/10/2015 (through DX courier - the personal couriers of HMPO)
Date of passport receipt: 21/10/2015 (through DX courier)
All the best everyone. My wait is over