Drauk
Of course I wouldn't doubt your actual results; however I wouldn't like to bet on extrapolating it to scenarios beyond the common UK "a PPL asking for a Luton transit" type of thing.
Especially to outside the UK, Class C transits at 5k-10k feet, etc. I've been in situations where it was apparent that they expected you to be right on the ball, or you got nothing. One is speaking to the foreign equivalent of London Control, who give you exactly 5 seconds to deliver the goods
I also think that IFR navigation (but VFR flight) is worth brownie points; asking for a VOR-VOR leg across the piece of CAS suggests the pilot knows what he's doing.