Yes - if we can kip in the gym before/after for a couple of quid per head, then it will make it more worth the petrol money. The 300 plan is to ride over to Kielder Water, which is a lovely run out and then loop back around via Gretna. The way I have done it involves doing the Kirkstone both ways, so you get twice the love, but there are a few options to consider. I'll mull it over.
As far as the FW goes, I would be very happy to run an event with a total of about 100 over three routes (so staggered starts and relaxed feeding on return) and have no intention of poaching the 1800 riders they host! 'The Fred' is a flagship event on the sportive calendar, but I am sure that many local riders would not want to do it year in, year out.