Worth a few minutes of your time...
Blurb from HM Government e-petition website:
"Re-introduce a 30 year rolling vehicle excise duty exemption scheme, for classic vehicles. For too long now the tax exemption of classic cars has been frozen, to only apply to those manufactured before 1973. History did not simply stop in 1972. These are not cars which are driven everyday but rather on sunny weekends, to attend enthusiast shows etc.. It is vitally important that we help to preserve this important part of British motoring history."
https://submissions.epetitions.direct.gov.uk/petitions/183