All good mate - I hope that the tennis was entertaining, I was there last night
Box seats through work I presume?
Back on topic: It was the latter. So I was traveling east, the camera was pointing east, and the V1 alerted to the front approximately 600m before passing the camera. So a 600m warning while approaching the camera from the rear! It wasn't raining. The road was still a little damp but there was no standing water.
Yes, it is legal to set up a camera when it's raining.