It's all random chance, I think. I did my QXC on the first day it was booked - only the wx at Biggin was a bit low, so I did Southend - Ipswich first cos that was clear, with the instruction to go back to Southend if Biggin wasn't 5nm or better when I was ready to leave Ipswich.
The problem was ... I'd never flown the route that way round, and finding Biggin when coming from Ipswich isn't easy. Wasn't supposed to be using any navaids, but the aircraft happened to have a VOR so a little cheating went on.
But that was 21 years ago and the weather isn't as nice these days, is it. Even nostalgia's gone downhill since then.