Sue emailed in with a photo of a mystery beast:
"I am hoping that might be able to identify this for me. I found two of them in a spare bathroom about a week ago and they are getting quite active now ! I should be most interested to hear what they are !"
Hmmm. It's a bit of a blurry photo which I thought, at first, was a woodlouse. Then I thought that Sue would know what a woodlouse is and I looked at it again.
And then it struck me! At this time each year I usually get a photo of some hoverfly larvae sent to me.
I think a few years back someone even found some in their bath too.
It looks like the larvae of a hoverfly called Volucella inanis. It's a big hoverfly with yellow and black markings that make it look like a wasp but, like all hoverflies, they don't sting and are an important pollinators in the garden. The female sneaks into wasps nests and lays her eggs - so, if it is a Volucella larvae - it may mean you had a wasp nest in your roof somewhere above the spare bathroom.
Anyway - here's a photo that I found online. Do you think this is what is lurking in your bath?
"Thank you so much! That is definitely what it is. I'm very relieved to have it identified."