"Curiosity" got the better of me and I hate to have something fitted that doesn't work, so started hunting on Youtube for Sportage sunroof and managed to find this vid:-
https://www.youtube.com/watch?v=DqFqNbAPWa4
I followed some of it to identify the problems and after a lot of cleaning, WD40 and silicone grease, I now have a fully working sunroof! Just in time for winter!!!
Total cost? Nowt but a few squirts of "consumables"!