To put it in more detail...
1. Pop bottom part of back chair of, its just clipped in at two points... sometimes need encouragement with a leaver.
2. Undo to bolts at bottom of upright part of chair, use a socket, as the screwdrivers always seem to strip.
3. Lift top part of chair, Its secured by three hooks, lift and move seatbelts out of the way.
4. Pop out the parcel shelf.
Reverse order to put back, careful with putting back top part of seat on three hooks, as they then to bend if seat is put on wrong.