For any owners who didn't see Watchdog last night Citroen are offering to repay the costs of replacing the rear air suspension and pay for repairs on any car needing them replaced.
There are restrictions but it seems many owners will benefit.
It's on the net under Citroen Picasso air suspension leaks, apparently the suspension was powered by air contained in rubber boots which degrade over a few years and air escapes causing the rear end to lower alarmingly.