Like you said 'to your knowledge'!!
Even 150 pounds a day is a disgrace. Much more than the servicemen and women who endure far more hardship than this lot. As to less pay in the UK, there might be a reason for that............37 hour week, flexi time, weekends, Bank Holidays off, Xmas and New year...and so on.
Tried to get some of ours to do a couple of evenings last year. Gave up after the bleating, time off for stress, Union consultation, rule books, line managers and threats!!