XH134, being a Canberra PR9, has powered flying controls on the ailerons and rudder. These systems are irreversible with no mechanical reversion so, in the highly unlikely event of a total hydraulics failure, the PR9 is unflyable. Unfortunately that probably puts XH134 in a category the CAA label as 'Complex'.
Every other mark of Canberra will have manual flying controls throughout and is therefore categorised as 'Intermediate'.