Fly Better
As a 2nd year 737 FO my P60 for last tax year showed £61,000.
This included basic salary, sector pay, duty pay, benefits in kind, and about 1 flexi day a month.
As I was away from base for alot of last year (rostered off to DSA) I didn't put in for much flexi, as I wanted to be with the family on days off. However I did get more duty pay for every hour away from base.
Regarding flexi, the easier days tend to pay more. Doing a day TFS or PFO will see you getting one payment for a 12-13 hour duty. However an early ORY (starting before 07:00 local) or late AMS (finishing after 22:00) encroaching on 2 days off, will get you 2 payments for a 4-5 hour duty!