Aceman, a big thanks for the bushes, just fitted them to the drivers side over the weekend after a leather bolster repair.
The existing bushes didn't exist anymore, they looked like black mastic with a lot of play in the carrier housing.
I think the seat had previously been adjusted to cope with the play as the carrier on both sides, when removed, needed 7 turns to get it off the 'kebab' but to refit needed 9 turns.
This is maybe why one side of the seat came off the runners at the end of last season. For anyone thinking of giving the job a go, the pictorial guide was superb, just make sure to have a T50 torx available.