Help please. Removing centre front seat - 2001 Defender 90

Trying to remove the centre seat to enable me to fit cubby box. Removed the 4 obvious bolts only to find there are two more at the rear of the seat frame and which I have no idea how to remove. Cant get a spanner to them. Any bright ideas out there. Someone must have encountered the same ridiculous fitting? Currently no seat and no cubby box.. Help!!

Pretty sure mine only had the 4 bolts. I remember the back ones were very hard to get hold of.

I seem to remember removing the two outer ones first, mine's also only got 4 bolts, 2 front and 2 rear