I wish we'd stayed with the Green ECC,
Ditto! I wish we'd stuck with the old system for everything. A lot of earths (or sleeving for earths) now seem to be predominently yellow with a much smaller green stripe. As you say, if it's turned the wrong way it can look like plain yellow at first. What was wrong with plain green?
One question, is that some sort of conduit that the load side cables are leaving the enclosure in?.
Looks like SWA glands to me, with T&E just threaded through them. I found the original thread in which this appeared, after a little searching:
http://www.diynot.com/forums/viewtopic.php?t=80440