Holiday entitlement - days changed

[Iguessyourestuckwithme]

When I started my job [January] I worked 3 days a week however this has recently gone up to 4 days a week [June] and I want to check my holiday entitlement is correct.

I have worked out that from my start date until the end of the year I will have worked 175 days. How does that compute to days off?

If your holiday year runs from Jan-Dec, you'll be entitled to 70% of the full time hours - half a year at 3 days (60%) and half a year at 4 days (80%).