Since I am doing the cambelt, I will also change the water pump. Ed from Fusion says its a good idea, so whom am I to argue 
I will obviously need some coolant / antifreeze once the pump is changed.
Is there anything in particular I need or can I just bung in some long life coolant from something like CarPlan or do I need something specific?
Also, any ideas how many litres of coolant I will need?

I will obviously need some coolant / antifreeze once the pump is changed.
Is there anything in particular I need or can I just bung in some long life coolant from something like CarPlan or do I need something specific?
Also, any ideas how many litres of coolant I will need?