Thanks for this help Richard...
I have now bought the V5 CDROM from someone in Germany for EUR 150 including post and insurance... exactly as you said - under £100.
There seems to be a few "traders" that dribble a CD or two every other day or so onto the market. Who knows where they are getting them???
I didn't buy from them. Instead I found what looked like a genuine seller that spoke english. Just a few points though for those of you reading this who might be thinking of doing this yourself...
--- You do not need to go to eBay.de to buy from sellers in Germany. I found out that by going to eBay.co.uk and searching Germany you get the same items but most of the page is in english! Of course, what the sellers writes is in german but I cut and pasted that into http://www.freetranslation.com
and got a free translation. I used that translation service to write to the seller to ask if they would sell to the UK.
--- Most of the sellers said on their eBay listing that they would only post to Germany but when asked by email they all agreed that they would be willing to post to UK providing I could find a way to send them the money.
--- It seems that in Germany it is normal for the buyer to pay the eBay charges so don't forget to add that to the price because over here the seller usually pays that.
--- I am using TipaNet, through my bank, to send the money directly to the sellers bank. It costs just £8 with no foreign exchange charges but that also needs to be allowed for. Note also that this service takes 6-8 days. You will need the bank code, account name and number and the name and address of the branch.
--- Insured postage was EUR 15
I was a bit uncertain about buying from Germany but it looks as though it will all work out OK.