I agree with Merlin,
I have operated on both sides of the pond, under FAR's and CAP371...
What the FAA allows should be illegal. There is no rest in the US rest requirements... And oddly enough, sometimes you can fly a lot further with an unaugmented crew under the UK rules, so its not about just rest... With REAL rest can come real productivity...
Because the government refuses to mandate proper rest for pilots, unfortunately its up to the unions to obtain it.
Cheers
Wino