"Whats the untaken holiday thing about. Are they paying off unused holidays"
Accrual of holidays = costs to the company. When staff take their accrued holidays = costs are then accounted for. Provides good manipulation over H1 and H2 results.
This is why most companies don't allow carry over of holidays into the next tax year.
In Capita terms: Staff did not take their holidays in H1. Furloughed members also got accruals of holidays. The company probably forced people to take majority/all of their holidays in H2.
So for H2 of the year: H1 accrued holidays taken + H2 accrued holidays taken - H2 holiday accruals = H1 accrued holidays taken = +$42.6m onto balance sheet for H2.