Ideal Crosser Bottom Bracket Woes - anyone gotta tool?

I have a 2006 Ideal Crosser which uses the German "Thun" Bottom Bracket and I need to remove it for replacement.

The bottom bracket cups have 6 half holes in the outer perimeter.

Can anybody please supply me with the necessary tool? Or information where I can get one? Or a part number?

It seems Ideal stopped producing bikes in 2012 or so. I assume that means spares as well. Ideal UK are no longer around which is going to make things awkward if I ever need another derailleur hanger, although I've got a couple of bent ones kicking around. They're not really the sort of things that can be straightened are they.