Can you do statutory and mandatory training as KIT days on your maternity leave?

I don't see why not, if your manager agrees that as being part of your work day on KIT days

I used 3 KIT days as mandatory training :) I helped with making sure I was in date for my return to work

Thank you, my manager hasn't replied yet. Still awaiting her response to book them

Yes, it's a good thing to use them for manager should be ok with it

Yes aslong as its agreed with your manager

Yes as long as your manager is in agreement