Perversely the insurance for the static excludes lightning but the policy on old croft house includes it.
I looked under the static this morning to check it , the frame rests on concrete blocks an the tyres are just off the ground , there is a burn mark on one of the tyres !!! and a drain pipe is "withered" and needs to be replaced.
The electrician said had it been resting on both tyres the charge would have gone to ground better , hence the earth pit and rod .
A shockingly expensive weekend