Well the bikes now being left at my desk so I can keep an eye on it, I told the office manager what had happened and said if you have issue with it being there tough.
I wont get an admission of guilt from who I think it is, if I catch someone touching the bike when I'm away from my desk I will kick off.
I have been putting the webcam on record when I leave my desk as the bikes in front of it.
Back on topic, it was great gliding past all the traffic again this morning, this partial commute by bike is really making a nice difference.