Can anyone help me decipher my wage slip please?

[TitsalinaBumSquash]

I work bank and I'm just looking at my wage slips and I don't understand the holiday part, I don't book holidays and it says on my HR portal that I'm not entitled to as I'm bank (makes sense) but it's on my wage slip and I remember them saying something about holiday pay but I can't remember what it was .. obviously I can go in and ask management to explain it but I'm not in for a while and when I am in I'm always rushed off my feet.

So it says for instance,

BASIC HOURS - XXX
Bank Staff Holiday Balance - XXX

Deductions

TAX - XX
NI - XX

Total - (Basic hours amount - deductions)

The holiday balance figure is going up every month, I don't know if and when and how much it will be. Is this a usual bank arrangement that anyone is familiar with?

You accrue holidays for every hour worked. Once you have accrued more than an average shift you can book it as annual leave (which, in reality, means you get x amount of hours paid without working)
I can explain a bit more if you like but don't want to bore you

Thank you. @Todaythiscouldbe, that is far simpler than I was anticipating.