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Thanks joko, I decided to give her a day to stew and hopefully think about her hasty (and yes,arsey!) e-mail!
Seems to have worked, she has been to the post office today and got a claim form ready to submit if the items do not arrive by 24th, and will also refund me.
Yes it really annoyed me that she offered the signed for delivery, then decided to make a bit more profit by sending them economy, well it looks like that little scam backfired!
Still leaves me without the items I wanted though :(