Done and fixed! At last! Shame about the complete lack of feedback to those of us that detailed the problem to them explicitly.

861v8, UHD722v2, 5200s, 5200HCSEup, M6s, 3200s, DSW, Sony 55A95L, Oppo 203, Sky Q Silver
Samsung QE43Q65B, Oppo 105 & Sky Q Mini