From the graun:
Professor Sir Ian Diamond, the UK’s National Statistician has told Sky News that about nine in ten people in England and Wales have antibodies against coronavirus, up from two in ten in January.
The group with the lowest at around about 60%, is those age of 15 to 24, he said
No idea what the equivalent NL figures are, but that 40% susceptible, plus the fact that a fair slice of the 60% will be single vaxxed which is much less protective, suggests there is plenty of shoe for a further surge here yet.