I guess it's always over what time period you are looking.
I did some research a while ago looking at Pay vs Inflation since 1975 so a long time scale that takes into account the rises due to Privatisation (from several companies competing for employees not just one monolithic one in control).
Employees benefitted from Privatisation on the pay front as there were now competing companies and not a singular company. I have found the weekly pay for a British Rail Driver in 1975 in Hansard
https://api.parliament.uk/historic-hansard/written-answers/1975/jun/18/pay-rates
This states from £41.65 to £53.10 now this might be crude but multiplying that by 52 gives £2165.80 to £2761.20 as the pay scale.
From what I can gather current pay varies by a large amount across the operators from a lowest of £30,000 to £70,000.
https://www.reed.com/articles/train-driver-salary-benefits
Calculating inflation using the
Bank of England Calculator gives that based on the 1975 wages rising only by inflation the current pay for Drivers would be £19,661.22 to £25,062.16.
Links are also present to the record in Hansard for 1975 pay, a recruitment site talking about pay per TOC and the Bank of England Inflation calculator which allowed conversion through decimalisation to the present day. I think we should always look over longer time scales because even if someone enters an industry after a big pay rise they are still a beneficiary from it. This is just for Drivers but the Hansard record also includes other professions.