Hi I took my import to KwikF here in Bristol, the connection required an adaptor which they actually did have so they could connect up. The issue with mine was that although their guages showed no leaks, guages are not sensitive enough to show anything other than a major leak, my aircon condenser/rad did have a leak as shown to me by the guy who eventually fixed it (Mr Cool), by the simple expedient of looking at the rad, seeing staining in one corner suggestive of a leak then spraying leak tester on it to prove it and seeing the bubbles. I don't think that particular guy at KwikF was really capable of any diagnostics.
Cheers