We believe this works, but we haven't got a video to test it. Therefore, it would probably only suit someone who is good with electrical devices, Mark Stukey from the repair shop or someone who is a risk taker.
If you are either of those, today is your lucky day.
Additional info: Apparently, it was working when it was put in the loft.
Video Player - Untested (Garsington OX44)
This offer has been gifted to someone and is no longer available.