Question Author
Thanks, both.
Ethel, I had understood from previous questions that it was the sellers responsibility. I tried to tell them exactly what you have just said but they wouldn't have it.
I've got through to the manufacturer now and they instantly arranged for it to be collected. They were only interested in the proof of purchase, not the packaging. Which gives the lie to the seller.
Had they not been so helpful I would certainly have gone the PayPal route against the seller - and that still remains an option. Unfortunately because it's over 30 days since the sale I don't think eBay itself will be interested in a complaint.
I always enjoy your posts here Ethel. Insightful and often amusing :-)
Thanks again.