Actually, if it drops below 1.054 it'll fall below the 1985 low that currently means it's the lowest in 37 years. That would make it the lowest since it floated in 1971. Incidentally floating GBP was introduced under Anthony Barber, 'as a temporary measure':
https://en.wikipedia.org/wiki/Anthony_Barber
who also holds the record for the biggest tax cutting budget in 1972. It didn't end well.
EDIT: typo