annual hol entitlement if working 3 days over 4

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I currently work P-T 3 days a week, I am changing soon so I will work my 3 days over 4 days - this means that I will work 3 short days and 1 "normal" day but I will work the same number of contractual hours as I do at the moment.
I am finding it difficult to work out whether my holiday entitlement will change or not. I am entitled to 28 days pro-rata - so currently 3/5 of 28 =16.8 (17), will this increase as I will be working more days a week - although not actually increasing my hours?

your employer will most likely work out your a/l entitlement in hours rather than days

sorry should have said your entitlement won't increase

as far as I understand it you have 4 working weeks holiday a year so if your working week is 3 days then you are entitled to 3x4 days holiday a year

Agreed, this is what I would do for PT employees but do make sure you agree where you stand BEFORE you change. Just ask them what they plan to do and where you currently stand.

The number of hours of annual leave that you receive should not change as you will still work the same number of hours per week.
Because you are going to work days of differing lengths, it would be sensible if your employer recalculated your entitlement in hours rather than days.
I don't know how many hours a week you work, but let's say you work 24 hours (3x8). This means that your current annual leave entitlement is 8hrs x 17days = 136 hours.
You should still receive an annual leave entitlement of 136 hours and deduct the hours accordingly, dependent on whether you take a short day or a long day off.

DH has just pointed out how wrong I am.. ignore me!

Thank you for your replies, I was having problems getting my head round it all but the annual hours make sense.