Hi drutt - you might give US Automotive (I'm not on a commission, honest!) as they ship in weekly and the volumes they ship will get much better freight terms than you do.
Otherwise, I've noticed that there is a shipping company that you ship your parts to in the US, and they then ship yours (and everybody elses) over together in one load weekly. You then get the benefit of the bulk shipping. I've never used them, but it sounds good, and I think they'll quote you for shipping, likely VAT and duty.
If you want more details, I'll dig out the advert (in American Car World, and Classic American mags).