i agree with all the above in various degrees, the words classic, and vintage are will overdone and indeed abused.
Take no notice
Insurance will accept anything over 25 yrs old as 'classic' but not,in my experience t if it's your everyday vehicle, my little used Morris 1000 is 'classic' but my 26 yr old Peugeot 205 isn't.
I thnk the reason pre 1930s bikes are so little seen is for several reasons, some owners are too old to ride much, modern traffic is just too intolerant of them, and on this island theres not much scope for a quiet run-out on one's own. Not where i live anyway.
Tomorrow though is the Banbury run where a good few not so rich riders will give their pre 1930 stuff a good outing.
I try to get out on my 1929 Sunbeam on quiet weekdays in between the school run idiots and rush hours. A lot easier now the need for an MOT has been lifted.
Just ride your Bantam, and enjoy it.