It's not a gardiner brush its a Bentley floor brush lol. It worked really well on leads that brush as well,do they not have lead lights in Cornwall lol
We have loads of them

In fact much of the testing that we did with these brushes was on a hotel with various types of lead lights (old and new style).
We find the Soft and flocked work well on leads - maybe not quite as well as a Super-LiteŽ Brush - 0° Splay - Flocked Bristles - but pretty good.