Thanks for your suggestions. Unfortunately the whole assembly is metal and prefabricated with steel brackets and frame. I was thinking of installing a second steel pole, with more height, close by with copper wire down the middle and earthed to draw any lightning strike away from the camera pole. Do you think this would work and if so how far away should it be sited and any other considerations? Also I see online there is a Chinese company selling 'prevention' systems (looks like an upside down brush) which attach to the camera pole, not sure if anyone has experience with these and if they work?
Thanks