It is pretty varied ,
The month just gone was pretty busy ! Usually in the summer months you will easily be able to get a day off working payment which boosts the salary significantly
High season £4500pm (maybe more at times)
Low season £3800pm
I'm not full time (12/13s) so I'm down roughly £300 pm , but I like having a month off in winter (full time is available) .
Last year after tax I took home around £50k so average earnings around £4100pm
Hope it helps