Derwent Inktense water-soluble pencils on 140lb. 24x32cm cold press watercolour paper.
I flooded the page with watercolour from a squeeze bottle, which had some interesting effects, but I think I'll dig out a spray bottle for the next experiment.
I'd just used the Inktence pencils for some sketch cards and the multi-media sketch below (done at McDonalds while waiting for the brakes to be fixed on my car). I'd bought some more inktense pencils and Liquitex paint markers for lack of bringing work with me to the mechanic.
I expect I'll be doing more work with both media going forward.