Just to correct some recent comments. The pay increments per year of service are not around 1000 pounds per year. The second year increase is 656 pounds. third year is 710 this increase will itself increase year on year. After 10yrs the increase is 903 pounds.
Subject to seniority a productivity differential is paid. This is paid in proportion to the crews flying widebodied aircraft, you do not need to fly widebodied aircraft to receive this but merely have the required seniority. This is not 25% of salary as mentioned but 11.25%. The most junior pilots currently being paid this has been with the company for around 12 years.