My wife and step daughter just received their British passports today. That's very quick, Dec 23th citizenship ceremony, filled in the online passport applications the same day, received the letter to make an appointment for the passport interview on Thursday the 14th of Jan (well I suppose the they deserved to have some time off over Christmas), phoned up that very night at about 8:00pm, got an interview appointment the very next day at 4:45pm and the passports both arrived today.
indeed very quick well done
Now its my turn hopefully everything will be ok for my cit application