I don't think any MkIIs had vipers fitted, just the MkIII, PhIII which needed a boost to get off the ground with the extra bits and pieces fitted. I wonder if the Hotel de France is still going. A wonderful place coming a close third after madames and villlage touristique. We once did a tour of all three in a landrover with 19 souls aboard. Never been so close to my friends before or since.
After that short trip with 37 I went back again twice 68/69 with 204/210 from BK.