IMPORTANT, IMPORTANT, IMPORTANT!
Pigsback is now refusing to pay out the full £20 unless you have your email confirmation showing you booked after they raised the rate to £20.
Without your confirmation, the b*stards are arbitrarily assuming that you made your booking during the short period that they were only offering £10, instead of £15 or £20. Even when I send the flight confimation e-mails with the correct date they will not believe that I booked my hotel on the same date.
You should therefore not delete any ICG e-mail confirmations until you have the £20 safely in your Pigsback account.