Parasol table top (Hitchin SG4)

Inherited.
Has been in the garden for a long time. The black spots you see are just snail shells some of which have disappeared once the table was moved. Needs a good clean.
It doesn’t have any legs but if yous is similar and the top needs changing this may work. Has a parasol pole cut out in the center.
Am quite sure a good clean will make it perfectly workable.