Check with your insurers to see if you're covered to Morocco, most UK insurers will cover you as far as the EU and not beyond. You probably need to apply for a Green Card going to Morocco.
I agree that you should get it fully serviced before you set out for peace of mind. A bottle of octane booster may help offset the low octane fuels in some remote areas if you have been running Super on the GTI. Tyre weld would be a good idea for emergency puncture repairs. Other than the standard travel kit you shouldn't really have problems (fingers crossed)!