to be honest,i wouldnt expect any extra money for airport standbies anyway,standbies are part of the job & can result in you being called out.if you dont like that,then flying isnt for you as all companies have standbies,both home & airport.
basic pay is about average for junior cabin crew in the UK however the flight pay is low,do they pay allowances downroute for food,or are crew expected to live on this?