It would seem the old E111 form for getting free treatment in other EU countries has now been superceded by a European Health Insurance Card
You can apply on line at this site :-
EHICI found this link on Capn Barefoot forum, tried the on line application myself and was pleasantly surprised by the speed of the response
all the info is on the site
Its a bit like taking a first aid kit with you, lets hope it's never used