http://cgi.ebay.co.uk/Tyneside-Irish...item588857526e
If I did not know that this badge was a s/t and had not seen lots of WW1 photos of the same and the NF cap badge in use, then this one might decieve one:
http://cgi.ebay.co.uk/Tyneside-Irish...item588857526e
The slider looks the part and the reinforcing bar is just like a Connaught Rangers.