As previously mentioned, I had to take a language test as part of the citizenship process. I received the results a few days ago and I'm pleased to announce that I achieved the required grade of B1. Luckily the certificate arrived in the post on a day I wasn't working. Therefore, I was able to quickly prepare a covering letter and hand deliver the certificate to the local municipality. So, now the ball is back in their court and I'm wondering how long it will be until I hear back about the next steps...