I like the idea of varnish like Ronseal Diamond hard over wax or oil as it's going to be easier to keep clean and wipe. I've read though that water based varnishes can't be used.
Make sure you use an oil based stain as the water based stains/finishes could lift the veneer. I unfortunately speak from experience. The doors probably had a label attached that will give you guidance or point you in the right direction.
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