Thank you for the responses, most helpful.
I have also googled/youtubed that topic. The example used something like a bicycle tyre lever. I had a tool like that which came with dash cam supply cable fitting kit.
That together with some ice lollipop sticks did the job.

Totally agree about the disintegration of the foam. The remains of that will have to be cleaned out, and something put in its place.

So far one screw removed and recovered.
Just have to work out a way of putting the binnacle back such that it doesn’t move/rattle. 

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