Just to clarify:
I phoned them and got the RMA and the go-ahead. Then today I wrote a letter stating i was sending back unused goods. I posted the letter and the screen (separately) by registered mail (i think its the Irish equivalent of Prioity Post in the U.K) and now have both receipts in my pocket.
I just have to keep the fingers crossed now.
As always thanks for the help Saracen.
q