assalaamu alaykum,
i would not pray behind the scholars behind the european fatwa council because of this issue and others, may Allah guide them, ameen.
here is a better opinion that does not seek to make haram info halal as the european fatwa council has done.
http://www.islam-qa.com/index.php?ref=101080&ln=eng
as this fatwa points out, their usage of the fatwa of imam abu hanifa is not correct as it applied to charging riba to a kaffir in darul harb not to being charged riba,
as well as this their usage of general necessity is very strange, i cannot imagine any muslim of the past whose example we should look up to thinking this way and i would prefer to live in a tent or a garden shed before i get trapped by riba.
assalaamu alaykum,
Abu Abdullah