I think that you have analysed it incorrectly. This issue isn't about 'fairness'. It's about Labour's fetishisation of certain professions. Nurses, doctors and teachers all had huge pay rises under Labour. However the IT industry's salaries at the low end have hardly budged. When I started in IT in 2001 the typical salary for a 1-year experienced IT monkey was £16k. It's now about £19k. That's roughly a 20% rise in earnings in 10 years, which means that in real terms (including inflation) IT workers have seen their salaries fall. There are private sector pressures here too, particularly outsourcing by corporates of tech functions to India.
By contrast nurses and teachers saw something like a 50% rise in income over 10 years and doctors a 200% rise in income.
The main reason for this was that the largest public-sector unions bankrolled Labour.
Britain's labour market is doing anything but heading towards a US system. By contrast, labour laws are so restrictive now that it's very hard to fire someone, and almost impossible in the public sector.