@Iceman's comment about the need for flexibility reminded me about
this thread about a planned trip for some of us to Glenforsa last "summer"
.
Reading from page 6 will give an idea of the near real time decision making, bail-out options and eventually the results we had.
As a VFR trip, it was definitely challenging; @Pete L and I always had a good abort available, but it was a continuous few hours of navigation and weather risk management.
It was safe, fun and good experience, but hardly relaxing!
What was notable at the time, and doesn't really come out from that thread, was how useful to each of us Pete and my pilot reports via the air traffic units we were working at the same time were, in order to enable two aircraft to make best use of the others' real-time weather experience.
It was my first successful trip to Glenforsa, and everybody else is 100% correct - it is well worth it. A gem for UK general aviation - everyone should fly to and stay there.