Yes, that's it exactly. The warm current has done a bit of a wobble and got sucked up into another current that has taken it further north than normal. I think this is what happened during the winter of 1963 when we had a big freeze. As far as I know, it should wobble back again during the summer. It's done it before because there was a mini-warm period in Greenland some hundreds of years ago when the Vikings managed to settle there for a while. I don't know whether anyone's looked to see if Britain had particularly cold winters at that time.

Global warming is actually a deceptive name. Climate turbulence is probably a better description of what's going on. As the planet warms, there is more change and more extremes. My husband has local date going back decades that clearly shows that the wet period has definitely moved by a few months.