I'm an independent contractor so I've got lots of experience attending interviews and talking with recruitment consultants. I agree with above that your experience is completely normal, they could just be taking a long time to get everything worked out on their end. If you got that far in the interview process, you stand a good chance.
What I wanted to say is that in my experience, the British don't like to tell you that the job is not suitable for you. More often than not, they just don't ever talk to you again. For recruiters, this is just business as they have nothing to gain from calling to tell you that it's just not going to happen. It's a long painful call with no benefit to them, so most don't do it. They just never call and dodge your calls.
I've had the same experience dealing directly with companies, they just can't bring themselves to have that awkward "no" conversation, so they take the cowardly way out.
Don't take it personally, it's a cultural thing. Fortunately, this avoiding of awkwardness makes them terrible negotiators as they will agree to anything to make the American stop talking directly about money. Take advantage of this!
You'll probably get a call out of the blue about that job, but in the meantime just keep plugging away. It's all a numbers game, keep the numbers of cvs sent out and jobs applied for high , and other things will come .