UK to Irish rules
Ive flown under UK rules - and found it quite common that cabin crew cant open doors from the outside - waiting instead for an enginner or in somecases the cockpit crew.
Just moved to an Irish reg'd carrier - and we were infact trained to do it from both sides - in and out.
Find it very strange that that certain LH airline in the UK doesnt permit its cabin crew to close doors from the inside under normal ops! its a good thing to be comfortable doing - incase that awful day where u actually neeed to open it quickly comes!
Just my opinion!