Well,
Pulled the parcel shelf out finally today, and it was a little different to your pics, basically there where a few metal wire clips holding it at the rear (near the bottom of the glass), two bolts for a child restraint anchor point, and two fins from the plastic cover on the C pillar that went into the rear parcel shelf..
Got most of the shelf off, but couldn't for the life of me get the right corner out.. finally after a bit of tugging it came out, but i managed to rip the thin bit of parcel shelf off at the back behind the breather grills.. so have to work out a good way to stick them back on..
So's life