Ok, I've finally sorted out the problem with lines double-spacing.
 
Sorry I didn't get onto it sooner. I was driving from Melbourne to the Gold Coast with beetwenty in an RA28 (1977 Toyota Celica Liftback) that I've just bought. Not a Datsun 1000, I know. Blashphemy!
 
If anyone finds anything else that's broken/annoying with the site or has suggestions, let me know and I'll look into it.