I wish there were more Z suppliers in the UK, i used to get a lot of parts from the UK from several suppliers (non-datsun), shipping cost very little and parts would arrive in 3-4 days, often faster than local suppliers.
The US on the other hand, shipping seems to take forever and the shipping prices are often over the top but what can you do, that's where the market is.
I've had good dealings with Datsun Parts LLC.
I ordered some bushings from MSA about 6 weeks ago and they still haven't turned up....