Hi Jon,
Good to know about the learn portal, I visited once some time ago but I can see there are good things to start with there.
Tapatalk is just and app to make the forums more accesible on smartphones, I use it and its great. Anyway, I can live without it.
I think you can track the shippments if you send by regular uk mail with tracking number, that also can be tracked once it is in Spain. Anyway, my suggestion was to choose between both methods, depending on the money spent I would prefer one or other, even without track number. You could add the cheap one with a disclaimer like "this is way cheaper but we can't track, we are not responsible if you don't receive it. You can always choose the other method".
Regards.