Similar to their previous deal but seems to be just from S.Wales and Bristol. You have to book 7 days in advance. May be of use to someone over Christmas?
To get an exclusive 20% off travel direct to the terminal door, just book seven days in advance. National Express offer the only direct and frequent service from Bristol, Cardiff, Chepstow, Newport and Swansea to Heathrow and Gatwick airports. We also have special group discounts available online.