One thing to consider is if the fitter supplies all the products and there is an issue with them after installation then it’s down to him to resolve, whereas if you provide the the products and they develop a fault you would most likely have to pay for the remedial works (though the products themselves should be replaced under warranty).
We have had all 3 of our bathrooms replaced over the past couple of years and with all of them I sourced everything except for basic plumbing supplies and the tile cement. It was a bit of a hassle but worth it to get what we want and at a reasonable price. The list of items needed gets surprisingly long!
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