Ok, you guys got me thinking, so here is a comparison.
On the left is the ESS BoB from Westminster 2008 (well it could have been an American English Springer)
In the middle is American Cocker Group 3 from Manchester 2008
On the right is ESS Group 1 from Blackpool and Group 4 from Windsor 2008.

I still say it is an American - it is the rear end that gives it away, angulation and coat:)