Well, I took up your suggestion this morning and went up to the market in town, I spent over 2 hours looking at ALL of the sunglasses on a stand there. The little rotund stallholder was in a right tizz, he was shouting and gesticulating, but being deaf and not understanding very much, in fact none at all, of his native tongue, I'm sure he felt I was ignoring him on purpose. Anyway after searching every pair of sunglasses, I could find none that were suitable. I was walking back to the car park when I spotted a small, privately owned Opticians. I thought, nothing ventured etc., and went in. The Gentleman owner could not have been more helpful. He looked at the 2 different bridge designs (the earlier and the current variety), went into the rear of the shop and came back out with an identical nose piece, of the type that is fitted on the current range of Pilla lenses. He fitted it whilst I waited and offered me the frames and lens back to try, after some minor adjustments they were spot on. I left the second lens there to be fitted the same. It is going to cost me £20 when I pick them up, but I felt that it was worthwhile. (no risk of postage etc.) So all is well that ends well. Thank you once more for your input and if you know of anyone that may be looking, I have 147 pairs of sunglasses for sale at £5 each !