2002 vaux combo spare wheel release?

[garlicbread]

Can anyone tell me how i release the spare wheel on a 2002 vauxhall combo. It is a dual fuel but this is manufacture fitted. It is encase in a black plastic donut housing. I have undone a bolt on the floor at the rear of the van, but this doesn't seem to do much as there looks like there are other bolts securing it in place. I have taken a couple of pics the best i can under the van. The van is also ply lined floor so cant see if there are any other bolts to undo. I have managed to prise it up a few inches to see if there are any other bolts but i cant see any.
The first picture shows the bolt i have undone.
the 2nd photo shows the other bolts to the side of the housing it is mirrored on the other side as well. I have checked the gas fuel piping to see if this space has been converted for the LPg fuel but it doesn't look like it to me.
Any info would be great.

http://i.imgur.com/iqeecVP.jpg[url]
http://i.imgur.com/uiquyVQ.jpg[/url]

 

[Burnerman]

Isn't the doughnut the actual gas tank...I can't see how there's room for both but there again, I know nowt!
Normally the spare is in a cradle underneath the doors behind the rear axle, with one hook bolt removed from inside.
Do enlighten us!
John

 

[garlicbread]

This is a picture from the back of the van. Im %90 sure its the spare wheel. The black doughnut is only plastic outer casing. I can also see the fuel tanks in the middle of the van .
Any ideas

 

[mfarrow]

You won't find any fuel tanks* behind the rear axle since the Ford Pinto fire incidents in rear-end shunts highlighted the issues with them installed in such a place. Nowadays they're under the rear seats.

* Aftermarket LPG is something different of course.

 

[Belle427]

It looks like a fuel tank to me, a spare wheel should be easy to get out with minimal or no tool use.