Kempus, your figure are out somewhere but I can't quite spot where, however I ran a quick spreadsheet and I calculate that a longhaul FO starting on £50,800 and receiving 33 annual increments of £1900 will earn a total of £2,793,100.
An FO starting on £50,800 but getting 24 annual incrments of £2500 will earn a total of £3,044,200.
That's a difference of £251,100.