It's surprising how few pilots I meet in real life when there are supposedly thousands of qualified unemployed ones all over the place!
As of 2008 there were approximately 17000 ATPL/CPL holders in the UK.
With a population of 61 million, you would have to meet 3588 people before you were statistically likely to meet an airline pilot.
Assuming that 20% of the 17000 are unemployed then your chances of meeting an unemployed airline pilot are one in 17941.