@TroysMammy I did this last night for you and forgot to tag you.
You will need to adapt this for 2022 because they moved the SBH to a Friday and added an extra day on a Thursday for the Jubilee. They have also now added the 19th.
Full Time BH 10 x 7.5 = 75 hours
PT 75 / 37.5 x 18.75 = 37.5 hours + 150 hours = 187.5 gross leave
Employee A (NYD Mon = 7.5, GF Fri = 0, EM Mon = 7.5, MD Mon = 7.5, JD Thur = 0, SBH Fri = 0, ABH Mon = 7.5, 19th Mon = 7.5, CD Mon = 7.5 BD Tue = 7.5) = 52.5 hours deducted.
Employee B (NYD, Mon = 0, GF Fri = 7.5, EM Mon = 0, MD Mon = 0, JD Thursday = 7.5, SBH Fri = 7.5, ABH Mon = 0, 19th Mon = 0, CD Mon = 0, BD Tue = 0)= 22.5 hours deducted