A while back, Simon Galley answered this very question on APUG. He said that Ilford (Harman) had no intention to enter the color film market. They did make Ilfochrome dye bleach paper for the Swiss IIRC and it was a pain to produce.

They do not have the equipment nor the capacity to coat color products on a WW scale, and expansion is expensive for this sort of thing. Kodak has a plant at Harrow which could do the job if Ilford (harman) leased time. IDK how that would work though.

BTW, Kodak Endura paper is made at Harrow and the boxes are marked "color" not "colour". It saves a pretty pence by leaving out one useless letter.