Hi carl,
It sounds like your being dicked around mate. Personally id take it to an independant garage via a rented trailer or recovery truck who knows what they are talking about. Do not go straight to the warrenty garage as they will try everything to avoid paying out on expensive work. And do not just take it to the closest garage your car got toed to as they know your in a vulnerable situation and probably take advantage as well.
Can you imagine 1 month down the line after a bodge job: "well you drove it away from us and now its broken again, its your fault" etc.
If your belt really has snapped like it sounds then get a full itemised list of the work that needs doing by the independant garage before approaching the warrenty people. Then once the work has been done under warrenty take it back to the same garage for an inspection.
Sure this way will be more pricey but you will avoid any bodge jobs to get you outside of the warrenty period!
Good luck!