Today I've spoken to two local dealers who confirmed that you cannot re write a trailer module and they can only program a virgin unit with software ordered direct from Volvo for my car.
If this is the case I don't see why they are being sold all over ebay as used.
So the long and the short is in order to get my trailer board working I need a brand new unit as no dealer will even try write a used unit.
The way this is appears to be panning out I could have had a brand new Brink detachable kit with all the wiring and a twelve month warranty for about £30 more than I will have to spend in total to get it sorted.
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