Isuzu recomend Ethylene Glycol at a mix of 50/50mix, just make sure you pre mix it befor toping up as it may not mix correctly if you put it in neat and can damage your engine.
Sorry pressed the wrong button.
I spoke to the EA last year about unlicenced boats on the Thames and got the same reply that you did, if you just moor your boat on the Thames you don't need a licence provided you dont use you boat for Any perpose.
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