This is generally how it is. For the entry level market you have a realistic choice of 5 companies like Barclays, BT, Amazon, SKY for limited positions while competing against the world for them. A fresh linkedin job post for tech even for no-name companies gets a 100+ applicants in under an hour starting at 30k salaries. I'm not even sure which startups are hiring graduates except maybe from Oxbridge. It is obvious a lot of people commenting particularly in this thread are ultra-privileged expats where "London" is just zone 1 for them and are well connected in the industry. They probably don't even know what Morley's is. Living costs along with the high tax rates alone will eat up your income and I know British people who work in international bank's at senior positions complaining about these things and about mass immigration all the time.

This doesn't seem true, I work in a UK tech company and it's an incredibly international team. My team has three Brits (including me), a Norwegian, a Swede, a Pole, and an American. The CEO is Irish, the CTO is German/American.

Obviously that's just one data point, but every tech company is similar.