The main grades in the outfield were: clerical staff, Officer of C&E, Allowanced Officer of C&E (the allowance was for taking on certain administrative duties e.g. rostering), Surveyor of C&E – all of which were at 'district' level and then Assistant Collector, Deputy Collector and Collector (regional management). The regions of London Port and Liverpool (later 'London Airports' was added) were graded as slightly higher than the others. All grades were amalgamated and incorporated into the general Civil Service grades in 1971.