The QC scheme is at AIP Supplement S010/2017 here:
NATS | AIS - Home.
Pages 9 and 19 show that all B737s are QC1 or less & OK for arrival; except for the now largely obsolete -200s (which are more than QC1), all are OK for departure too. Government and military exempt from QC scheme, although they still count towards the monthly 120 per calendar month limit during the night-period. The QC scheme is not a restriction on B737 operation therefore.
Perhaps
asdf1234 using a different QC scheme to the rest of industry?
Agree that the helicopter restriction is somewhat inflexible, this could actually lead to
more noise from a helicopter arriving early AM that has to be held until the curfew finishes before landing; this would cause extra noise that the helicopter curfew is meant to eliminate. It would be better to have a limit on helicopter movements, that come into the overall monthly quota.
Police, Coastguard, Helimed and miltary helicopters can operate at night, it shows that exceptions can be made. Allowing a very limited number of civil helicopter movements perhaps should be facilitated by the local Councils.