It seems the sealant damage issue is more down to a fitters care rather than reliance on one with Morgan experience. My local tyre shop managed to remove and replace tyres on mine after my spoke tightening issue
I did explain they were sealed and to take extra care when first removing tyres for investigation but local company didn't have any sealant so it was down to me to find the correct stuff and effect repair. They were equally careful on re-fitting, double checking for leaks afterwards and I've had no trouble since
