Basically pull the bottom of the seat up until the seat unclips from the base. There are 2 clips, about a quarter to a third of the way in from the sides of the seat. You have to pull fairly forcefully to unclip the seat. Just checked my seats today, saw some wires, but didn't look like there was any plug on the bottom of the cushion, so I think Pete got lucky. I'll check again this weekend and see if there is a plug at the back of the seat cushion where it meets the backrest.

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