When in the UK, and 'pottering' around Yorkshire and the North, although I have an idea of the weather and conditions in all the areas i'm planning to operate I often don't decide where I want to go until airborne and done some manouevering and practice.
I call up on the air-ground frequencies and ask for joining instructions if they can accept me. Never been refused yet, and if I was I'd just take it on the chin and continue to the next place.
No real reason for not asking PPR, and on a longer distance route I'd probably be much more prepared. But in the local area most of my usual bacon buttie haunts have no expectation for you to call PPR despite it being in the Pooleys.