Under the EU's Schedule, the the UK has a trade weighted average tariff of 1.96-3%.
Source 1: data.worldbank.org/indicator/TM.T…
Source 2: data.worldbank.org/indicator/TM.T…
To suggest the UK could see similar results, even fully liberalizing is insane. There's far less to cut!
Prior to tariff cuts in 1988 Australia was among the most protectionist developed countries.
Except in select lines (mainly in Ag) the UK in the EU is among the most liberal.
data.worldbank.org/indicator/TM.T…