Had a wee squint at tg:20 and it simply states that "guardrails shall be connected to the standards with swivels or right angle couplers." No provision for single on the stop end I'm afraid, another bad habit to break.
As for the rest, it get's a bit complicated. I thought Aberdeen's were required on a fully sheeted job but unless I am now reading this wrong they aren't. All that is required is the top lift to be tied even if the lift below is already tied. Even heavy duty jobs don't need them, all that is required is a supplementary fitting at each standard to ledger connection and then it's only if you have a 4-5-2. The transoms are reduced as well as the bay size but that surprised me, the long and the short, no real need for Aberdeens. The returns is a wee bit vague for a thick scaff but as best as I can tell there is nothing to stop you underslinging a return with a single.
Can't wait for the rewrite. :laugh: