20,000 units electric bicycle sales in the UK in 2011 seems quite a lot considering that electric bicycles are quite hard to buy, maintain and get support for in the UK.
http://www.bikebiz.com/index.php/news/read/uk-bike-sales-slip-in-2011/013764
2nd in bicycles sales, 7th in e-bicycle sales in Europe. Germany tops both.
But just not enough? Not enough for what? Do you want a bicycle with power assist or a moped with pedals?
It's funny reading about the USA, Canada, Aus and even China struggling with the difference between E-Scooters and E-Bikes.