Just got some stuff from Eddie Marine - http://www.eddiemarine.com/
- Stainless marine do the best Jackplate / Lifter I have seen to date which most people use in offshore - http://www.stainlessmarine.com/
Although Bob Irwin had a twin ram one on the boat at Exmouth which looked fantastic.
I think most of the American sites will export and to date I have always got stuff quicker than dealing with British companies! I can Recomend UPS - they really have got it together, but make sure you have the right money if paying the duty by cash - the drivers don't keep change!