It doesn't look a great install with all those adapters!
Is there an isolation cock on the pipe work in the immediate vicinity of the appliance ie in the cupboard adjacent or behind the oven , if not then that wouldn't pass for an ACOPS approved installation.
The gas safe engineer that installs the new hob, will be able to assess whether the pipe size and fittings are suitable and whether there should be a local isolator installed.
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