Thanks for this; we did try, but made no difference...we now know why!
Hidden in the front of the mains plug (the pronged side) for the 12v transformer that powers the AMB box is a switch to set the voltage; it had been moved from 12 to 7.5, hence it was on, but with not enough power to the loop!
Tried everything we could think of last night, sadly we didn't think of this!
Thanks again for the reply; solved.
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