"As I see it the N12 PY is based on the clubs' PY returns for the all N12 fleets across the country and is therefore made up of results for all boats, old and new. I suspect the 'true' new boat handicap is therefore sub-1093, and old boats higher than 1093, leading to an 'average' of 1093. For the N12 class to say that 1093 is good only for new boats could be construed as being somewhat dodgy ;-)
I would therefore vote to keep it as a single number, in the same way other classes, development or not, have to contend with. We all know that it is possible to 'cheque-book sail' to some extent (otherwise why would we buy new sails/boats?) in order to remain competitive. If I bought an old IC, another development class for example, I wouldn't expect to be treated with a more favourable handicap than the new boats."