Laburnam trouble

Hi, bought a Laburnam tree in April and it was doing very until recently when something decided to eat all the leaves. Honestly they are stripped nearly bare!!! I have found a few snails on the trunk but can't see how they could stay on the leaves to eat them. Any ideas what can be the cause?
Jan
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Snails have sticky slime - they can hang upside-down on laburnum leaves
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.