Had it with me for a group ride from the Roman Lakes car park in Marple on Sunday. Took it out my pocket at the end of the ride, reset it and turned it off. Reckon I might have left on my bike rack and headed off. That road is a mess so it will have fallen off straight away but I've been back and had alook round and spoke to the cafe ownwers.
If anyone is out there and finds it can hand it in to the cafe or PM me please (email in profile).