Works well Ian.
I'm going to take it a step further and reversal process the paper images something I've done before after attending a lecture back around 1973. The lecture was by a research student doing a PhD he was shooting FP4 slides - so reversal processing the film, the making reversal B&W prints on Ilfobrom, not so easy as there were no resin coated papers then, the quality was stunning but the controls needed to be so tight.
Ilford/Harman don't cut and sell UK sizes like 12"x10", 15"x12" etc of their Direct Positive paper only the US 14"x11" which just needs simple development (as you did), so i've no option except add te extra reversal steps.
Ian