The 8th Jan threshold has been in place for some time, it’s obviously done to their advantage. Last year I had a 1980 to register, as always I put 01/01/ and 80 as it was a 1980. DVLA accepted it, and no road tax was paid. On US titles ( log books) they only list year of manufacture unlike ours which list date of first registration as the year, worded as declared new at date of first registration. Hence how some Triumph stags have S and T registration plates along with 1978 log books to match, yet they were last manufactured in 1977.