I can't locate this having been done before, though maybe I'm just not finding it in advanced search.
Lets use the situation from another message thread for the hours/weeks involved:
Nanny works 4 days per week. On a School Day they work 6 hours. On a School Holiday/Inset day, the nanny works 12 hours.
Lets say that school term time is 38 weeks.
Lets say that school holidays + inset days, is 14 weeks.
How do you calculate holiday entitlement?
38 weeks x 4 days = 152 days x 6 hours = 912 hours
52 weeks - 38 weeks = 14 weeks x 4 days = 56 days x 12 hours = 672 hours
Total working hours per year: 912 + 672 = 1584
Is it as simple as 12.07% of working hours?
Of which nannies statutory holiday: 191.2 hours (12.07% of the working hours)
Or will that present problems, such as if the nanny is restricted in taking holiday only during school holidays, would all days off be taken as if they were 12 hour days? What about bank holidays during school term time... if nanny got those off as well, would they be 12 hour days, or 6 hour days?
Do we need to calculate average working hours per week, so 1584 / 52 = 30.4615 and then multiply by 5.6 = 170.585 (round up to 170.6 hours).