thanks mark for responding. sent text message to my rep and the email and she just contacted me now by phone ( 23.15pm my time) and she is very kindly going to contact the airline for me in the morning and if required have engineers speak to the airline. so problem will hopefully be sorted and I will be allowed to fly. definitely going to tell them less in future as i think they thought i could interfere with airline electrics ! anyway for now hopefully disaster is have been avoided!! HOPEFULLY! but does look like i will have to have my unit completely powered down for the journey which is not good