Not 100% sure, but as public funds are being used to pay for the ongoing legal matter (even if the public do not need to know what the legal matter is) then agreeing the amount should be public. Even in your item 22, they will know that the payment is to Thomson & Bancks in respect of an ongoing legal matter, but is there a genuine reason not to be honest about the cost is, especially as it will have to be shown in your 2019/20 end of year budget, so will then become public
If you dont at least tell them the amount how will they have confidence in what is being spent on their behalf