Submitted application first week of March along with biometrics.
Approval email received 2nd June.
Citizenship ceremony invitation letter received in the post 3rd September; dated 24th August.
Bedfordshire council didn't book the appointment until I had received the letter.
Hope this helps.

I think we should all contact the BBC via Have your say https://www.bbc.co.uk/news/10725415 There was a news piece they did about delays in getting passports; and it seems since then passports have been getting approved quicker than expected. Of course, passports are something that affected a lot ...