Well feedback as requested. The chicken itself was really soft and tender and literally fell off the bone. I had some this evening and now have enough left to make another three, if not four meals (it was a large chicken though). You won't get the crispy skin you get when roasting a chicken and I do think the flavour is a bit more subtle so you need to spice it a bit more, but I definitely will be doing this again. Esp as I tend to use a chicken for various dishes; the meat is so tender and easy to split from the bones.
The one thing I would do differently next time is not add any stock or if I add then a lot less. I put in one cup to start which, once the chicken was added, was about 2cm up the side of the slow cooker; by at the end, when I took the chicken out it was about 10cm (so 1/4" gone up to 2" - for those who prefer imperial ) which means most of the chicken boiled in water vs it's own juices and that I think is what may have reduced the flavour a bit.