thanks pristine for suggestion but i should have been clearer. i need it to fit in spaces as small as like behind a radiator, but not to actually go behind the radiator because as you say it wont be as good. i use a tool that sounds like the one you use which i find works great for rads.
one example of where we could do with this tool is in one of the offices we do between their desk and under desk cabinet there is a small gap with a lot of crumbs and dirt which i can't stand seeing. i can't move any of the furniture so thought perhaps there is a tool that'll attach to the vac that will solve this problem