One ( G-BUSD ) has been withdrawn and parted out at Lasham. It is 20+ years old and the A320 was not built to fly forever, unlike the B737. Not a criticsim just a different approach to design. And considering they are being replaced by more A320 series aircraft it seems to be working. The remainder of the G-BUS* series will be withdrawn over the nect 12 months.
The choice of aircraft is a high priority when no new long haul machines have been delivered in the last half decade. The competiton must not be allowed to get too far ahead.....