Hardly. Crossrail is the largest construction project in Europe and most contracts went to UK firms, most staff were trained on-site in the UK at a specially built tunnelling academy and so on.

Well that’s a step in the right direction but look at all the public sector IT work going to outsourcing companies who promptly offshore it.

Can you be more specific? I'm sure it happens a lot, but if the product is delivered successfully then no problem, right? UK unemployment is very low despite massive uncontrolled immigration from very tech savvy populations, so there's not exactly large pools of unemployed domestic software engineers for governments to tap.