My friend found a possible Klaxon FP6 of some kind in Carlisle here:
54.932673036554654, -2.9635502921285233
I have attached some images of the siren. Bear in mind that I have only had chance to visit this at night so far, so I will take some more photos in the daytime in the near future.
What is strange about this siren is that it appears to have a square object around its motor, which I don't think is normal for Klaxon FP6s. The front of the siren also has been fitted out with a heating implement, as suggested by Klaxon to thaw out the siren for use after cold weather.
The square motor thing still confuses me, so if anyone knows what it is it would be very much appreciated.
Thanks.