Can we really say that there was no response? (not meaning this antagonistically, btw - just interested in the point some have raised on the "failed SSW")
My very limited understanding is that there absolutely was a response in the troposphere, and we saw the PV split into three distinct lobes.
We've simply been very unlucky again with how the lobes positioned themselves - one of them over Canada and northern USA and never retrogressing.
The Jet was therefore well supported with very large gradients over the northeastern USA.
In that set up, everything was stacked against us to promote a cold easterly or northerly scenario. But saying that, that winter was hardly Atlantic-driven, just HLB in our locale was not forthcoming.
So my summary is that we have had a somewhat more blocked winter, strongly supported (globally) by a major SSW, but Blighty just wasn't in the right spot for cold again this time.
Happy to be corrected on any or all of this - as I'm confused by the failed SSW response point.