Can i refuse hours increase

duchy

I used to work for " a large pub chain" basically school hours .
I'd sometimes be asked if I could work on or come in and do a weekend evening shift. Sometimes I Could and did , othertimes I didn't . It was an odd dynamic as those who always said yes were taken for granted . I had a manager moan to me that he'd asked two people to work their day off and both refused. I pointed out both had been working double shifts seven days a week for the past four weeks and they were both exhausted.
Gave him food for thought as he always saw me doing extra as a favour but had taken umbrage when those whose willingness to work extra he'd taken for granted said no.
Funny things managers.