I needed an awning for camping and track days, and after looking at a few options I purchased this ARB 2.5m pullout. Here's how I got it to fit, and some comments on build quality.
Nice work. I also have a 100 series, and I'm probably not far from you [Im near Edinburgh]. I was thinking about getting an ARB roof rack - you need to remove the factory roof rails to install them - and an awning similar to yours. Its an expensive business!
I've got a set of Gamaviti mounts I imported, which go into the factory bolt positions. Tricky to fit, but gives a load of options for putting on DIY racks. Arb ones don't fit the UK 100 series unfortunately. Found that out the hard way!