Seatbelts and the law

got pulled over today and asked why i wasnt wearing a seatbelt, i said i didnt have one (which is true), the officer didnt beleive me so i let her look in the cab, she then said she was sure vehicles of this age (1996 n-reg) needed to have seatbelts fitted, then said something about a “new regultation”, in the end she let me go taking note of the

is it now the case that all trucks must be fitted with seatbelts?

If it’s a '96 plate then it didn’t require them fitted when new nor does it need them fitted under any “new regulation”

cool, at what year did the seatbelt become compulasry?

Oct. 2001 for goods vehicles over 3.5t