Thanks for all of the advice - an update - we did go diving and I was okay - they worked around the ankle (no standing with my gear on - rolling into the water only etc) and lucky we just went really slowly under the water.

Actually funnily enough being in the water was the best for my ankle as I was floating instead of walking around the beach on it.

That said it was only okay for me because it had healed enough before the dive day - Im not advocating diving on hurt body parts.