You could always ring the inland revenue and ask them, I would guess it depends on how it is entered on your payslip.
If it clearly says night out and shows tax you may have a chance.
That’s an assumption not based on fact. I only do occasional nights out and add them on my timesheet as an extra charge, I pay the tax as I don’t want my lot thinking £26.20 is the maximum they can pay me. I just book them at £50 and pay the tax.
Of course they bump up my earnings a little so average holiday pay gets a little lift too!