Managed to get the bonnet off by standing on the wings and lifting it off its hinges. Then laid the bonnet on top of the wings, hopped onto the floor and got it off that way.
I've taken the first wing off (left hand side) which was a bit of an odyssey seeing as I had no idea what I was doing and every wing removal video I've watched shows you a shot with the wing on and then another shot with the wing removed and what goes on in between is a mystery! I also discovered that it's a pretty fiddly job to do on your own. I sprayed loads of lubricant on all the nuts and bolts and left it to do its thing for 24 hours. Amazingly some of the nuts and bolts came off really easily but others were so badly rusted I had to use the angle grinder to get them off. The worst were the screws on the floor panels - some came off with an impact driver and others had to be chopped off with the grinder. I didn't have one of those 14mm extra long socket spanners for getting the bolts fixing the wing to the bulkhead off but managed to join up a couple of extension bars and that did the trick. A little while ago I was tempted to buy one of those trolley things for getting around underneath but have discovered that a 20kg bag of dog kibble does the job pretty well.
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I started on the the other wing this afternoon and the second bolt down was a total nightmare: not enough room to get the socket spanner on the bolt and nowhere to wedge the spanner in on the other side. I eventually managed to get the thing off with a back nut tap spanner and a large screwdriver holding the nut on the back and a bog standard spanner to get the bolt off. Anyway, got all the bolts joining the wing to the radiator off, the floor screws off, the bottom nuts and bolts on the mud guard. Hopefully I'll get the top ones off tomorrow along with the bolts on the bulkhead and finally get the second wing to come off.