I was on crap wages when I was a cleaner for 2 years too, heaven knows why cleaning jobs didn't pay as much as other, more qualified jobs, never did understand that. If you want a better deal you strive for a better job, not use blackmail. If the LU cleaning jobs are paid less than other cleaning jobs (say, in other sectors) then prove your point by going to work there - LU will soon get the idea. To strike over BH days shows less spine and more of a leaning to blackmail.