yep UK is 1:50
Our legal minimums are:
B733's seat 148 - 3 crew minimum
A320's seat 180 - 4 crew minimum
B738s seat 189 - 4 crew minimum
A321's seat 220 - 5 crew minimum
B752's seat 233 or 235 - 5 crew minimum
B763's seat 258-328 - 8 crew minimum
Not saying thay actually operate with that number
Actual standard crew complement is
B733's seat 148 - 4 crew
A320's seat 180 - 5 crew
B738s seat 189 - 5 crew
A321's seat 220 - 6 crew
B752's seat 233 or 235 - 6 crew minimum
B763's seat 258-328 - 9 crew minimum
Similarly Easyjet has 156 seats on their A319s so they require a min cabin crew of 4 when operating with that number of pax.
Guess EU regulations are more generous than Oz.