robbie d
See if you can spot the difference;
There are ATCOs valid on Gatwick radar at TC who used to work for NATS at Gatwick and who now earn more money than their former colleagues at Gatwick Tower.
There are ATCOs valid on Stansted/Essex radar at TC who used to work for NATS at Stansted and who now earn more money than their former colleagues at Stansted Tower.
There are ATCOs valid on Luton radar at TC who used to work for Luton Airport until NATS won the contract and moved the radar function to TC and who now earn more money than their former colleagues at Luton Tower.
It might not be fair but it isn't the fault of the individuals. That said, within reason all staff at a unit should achieve the unit minimum competency but that isn't unique to TC.