I seriously looked into doing this, a couple years ago. Not only was it too expensive, the UK Club had no interest in cooperating with such an effort. I could not find a breeder there, who had good Dorkings, who were willing to even talk about such a venture. Actually, I didn't see any photos of Dorkings that were any better than what we have here, now.
Importing to Canada and then to the US is the easier way to go about it. There is a lady in Canada who went to the trouble of importing Dorkings from Holland. After all her work, the imports have good basic type, but still have defects & dq's. IMO, the Dorkings that she has been working on all along are nice examples of the breed. Her biggest issue with her own strain is white ear lobes.
I probably wanted to import Dorkings more than anyone, at one point. Now, I think it's not worth the expense & trouble. I also searched all over the US and contacted every breeder that I could find (not just through BYC). Now, I've come to the conclusion that I'm just going to have patience and keep trying to improve upon my own line.