Good idea getting this sorted so early.
I think between them Dennis and James have solved the bulk of the issue with postage costs to overseas members.
The only issue I see, is one I think cropped up a few years ago whereby one member never received their SS present. Their SS claimed he posted it but it never turned up. I can't remember the names of the people involved, and I've no reason to suspect the SS didn't post the present, I just know the person left with nothing to open was understandably disappointed.
Not entirely sure how you prevent that from happening, items will get lost, and as it's a £25 (ish) budget it's hardly worth paying for recorded delivery. Possibly get the guys to keep the receipt just in case the item does get lost.
Anyway good luck with it all guys!