Hard one to describe, but I'll try.

The leather seat covering on the rear seats seems to have come adrift from the bottom of the seat, so I can see a sort of plastic edge that seems to secure into a metal edge on the seat frame, but having tried to push it back in, it just pops back out.

is there a special tool that's needed to get this back in? It looks like the plastic edging has a lip on it that would hold it in place, but to no avail.

Any help appreciated! Got - 2017 SDV8 Autobiography in Loire Blue
Had- 2008 TDV8 Vogue SE in Java black
Had - 2007 S/C in Stornoway Grey

Alan, they fit by turning over on themselves which creates the tension needed to keep it in place... Check the same seat on the other side and you will see its not just a case of hooking it back over, more turning it over, pulling it and then hooking it over

Cheer Craig, I'll give that a try!  Got - 2017 SDV8 Autobiography in Loire Blue
Had- 2008 TDV8 Vogue SE in Java black
Had - 2007 S/C in Stornoway Grey