Thanks for reading, I've taken on a new role at work, it only involves an extra 4 hours a week paid at a higher rate as it's a more senior position, HR have just told me that I will not be paid the 4 hours for the week I was on annual leave as they are not contracted hours, but neither are they classed as overtime (for which we accrue holiday pay) because it's paid at a higher rate. Can they be neither?