Spot the wasps

We've had new alarm bells fitted today after one of the old ones malfunctioned during a recent power cut, in that it didn't cut out after a set period of time and kept on ringing for ages. They had been up for quite a long time so were due replacement by the latest models. It turned out that a couple of wasps had been nesting in one of the alarm bell  units which explains why we were occasionally visited in our bedroom by wasps, as the alarm was positioned on the wall nearby. Happily they both stirred themselves and flew off, one initially into our bedroom! It remains to be seen whether they take up residence in the new alarm bells.