They just replace the foam, and in my case the seat cover too as even though it seems to hold its shape the inside gets a nasty crease in it.
As I said it didn't last long. I'm going to replace it myself this time; the plastic trim will need to be removed from around the seat and then i'll know what I need to do.
The seat foam (its the full seat base) here is c£100, but the seat cover (just the base) is £745! I've managed to get one shipped for £33 off ebay.de so have a look on there should anyone want one. No-one is wearing out passenger side seats in mainland europe and this is what they are and sold off cheap- perfect as its our drivers side.
I'll report back once I do the job.
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