The EU manufacturers have an eye on this market; you have the Leaf (made in Sunderland UK, as others have pointed out), the Renault Zoe, Vauxhall Ampera (rebadged Chevy Volt), BMW i3.

However, I wouldn't describe E30k as "budget"! I might be tempted by an ex-dealer secondhand Leaf at £10-£15k: http://www.autotrader.co.uk/used-cars/nissan/leaf