Need to make a lasagne in advance, but won't be able to stick it in the oven till the next day. My plan is this, make up basic bol sauce, layer it with the lasagne pasta sheets and (Dolmio) ready made white sauce. Let it cool down then leave in fridge till it needs to be cooked in the oven later. Does this sound ok? Do I need to let the bol sauce cool down before adding the pasta and white sauce?