Many thanks chaps, (presumption is only an effrontery!).
Well there are cunning plans and then there are cunning plans. Life would have been so much simpler if this stuff was dry - (the DARA Bedford wind tunnel seemed a likely place to do some reverse engineering!) - however, by the time the airframes had been subjected to our English summer (road move), the rules had changed and it wasn't so much getting back to the drawing board as re-inventing the bl**dy thing.
So as we couldn't find the fat lady, it meant some heavy duty stripping until we did find the low water mark. Needs must and after sampling various appendages on the end of a wet & dry industrial vacum cleaner, things improved alittle. I still believe in experimenting so we shall try lowtox in a pressurised sprayer. I love it, engineering in the rough, or is that raw? No, it's in the dunes!
Thanks again.
ML