They say this one has 70% greater ability to transmit, so it will become obvious fairly quickly if it has arrived any particular area, I would think.
All talk I've heard from scientists over the last few days has been confident the vaccine will still have the desired effect on this strain but we'll have to see.
One thing is for sure... Things feel fucking bleak right now, particularly for those in London and other places locked down over Christmas. I never imagined things would be worse at this point than in April.