I did some googling and the results suggest the average IT grad salary in London (which is very expensive and features some of the highest salaries) is around 30k.
the first source does not show grad salaries and the average is 57.5k, which is still a lot lower. the second source is paywalled and I can't open it at all.
But https://www.cwjobs.co.uk/salary-checker/average-computer-sci... shows much higher salaries than 30k in london and germany too (https://www.statista.com/statistics/584759/average-gross-sta...)