Ram mount is no use as it uses the original gripper that comes with the tom tom. This is the thing that fell in half and was never much use anyway.
Not sure if the touratech one will be able to run off the bikes elec. system as it doesn't seem to have the contact plate in the back.
Touratech stuff always seems over priced and has a built in a shed look to it,
Will carry on down the touratech rout though, looks like my only option
Thanks again Matt
have fun with your helmet!