The parcel shelf in SWMBO's Corsa pivots on two plastic pegs which fit into holes in the rear trim - or rather it did.
The aforementioned plastic pegs are 12mm dia & about 70mm long - alas the hole in the trim is much deeper and the pegs aren't fixed - so both disappeared into the innards of the vehicle.
Popped into a Vauxhall dealer today to purchase two more, which the didn't have in stock of course.
They could order them. £7:35. Each!!!!!! Nearly £15 for two plastic dowels!!!!
One length of 12mm dowel from B&Q later - sorted for £2:48.
No wonder Clarkson hates Vauxhall !