Mate minimum wage, you shouldn’t really knock it back. If you do a 13 hour day that’s £106.73 a day, so they may take an hour off but it’s still £500 a week for class 2.
Haven’t done U.K. work for quite a while, but as a class 1 on European out for a minimum 3 weeks, I’d be looking at about £570 for a 5 day week in the bank but £180 of that was night out and meal allowance.
Most of the replies you’ll get on here will be negative, and drivers will be claiming they get loads, but they’ll work their max hours for £550.
At the end of the day it’s your decision and you need to do what best for you, the offer of class 1 is a bonus, but don’t get tied down with hidden contractual obligations