When I looked into starting salaries (about a year ago), the highest paying of the bunch were Thompson, at around £35k. £35k FYI after tax is less than £2200 take home.
I would be _very_ surprised if the BA FPP salary was anywhere near £4kpm as quoted by the person on the previous page. This sounds like fantasy to me, even if it were before tax, you're talking £48k starting salary. But eager to be proven wrong!