As an update and to give other people who are in the same situation some hope, I can confirm the Home Office was happy to re-issue the approval letter with a new 90 day period. The ceremony has now been attended, and citizenship obtained. It took about 3 weeks from appealing to receiving the updated...

To answer the questions above: no home office letter was received. The link to the post by another person in a similar situation is similar, but in their case there was a clear error (the Home Office wrongly addressed the letter) whereas here it seems the letter(s) were correctly addressed, but just...

A family member applied for citizenship late last year. She rang the home office for an update after 3 months and was refused an update due to being within the 6 month waiting period. Now, after the 6 month period is up, it appears the application was approved 2 months after submission, but the appr...