No2EU, from as far as I'm aware, is a non-partisan coalition. It's not exactly what I'd call leftist considering it's manifesto orients entirely around receding from the EU. ("New") Labour is also hardly what I'd call representative of the left nowadays. Increasingly I'd say Greens are the only real, major left party nowadays.
The "growth" of the BNP stems from the new found apathy of former centre-left voters who have lost faith in the parties they would normally vote for. UKIPs growth is similar, and achieved through being the next big party after the main three rather than a genuine change in a shift on opinions.
So, the left parties have taken a beating but I don't think the actual left is altogether different.
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