Sorry if this is an odd request first of all.

I need something picked up from there and posted to me.

All you need to do is go in there and pay (I will get them to put the item aside), BACS you the money or whatever is easiest. I will also have DHL collect it from you and courier it to me.

And I will also give you £15 extra for your time.

Reason being I've found something I want to buy... but cannot get hold of it any other way, store is unwilling to arrange a direct collection so yeah.

Yes this does sound dodgy as hell, but meh.