That actually appears to be a Darley 3V8, but for some reason it looks awful small up on that pole. Anyone ever heard of Darley also producing a "2V8" based on the same construction as the 3V8? If so, that may be what this is instead, but otherwise it looks to be a 3V8.
Here's the street view image for anyone else interested:
http://g.co/maps/8vjk9
Just for reference, this is what it appears to be (Darley 3V8):
