OK its been said before on here

But silly me, I placed and order yesterday morning and upon checking today,
they dont intend shipping till tuesday
When I asked why, they said - computer error, it should have gone but didn't
great, this was in response to a mailshot from them saying "get your orders
in for bank holiday diy"

If you can source elsewhere. my vote Ignore Screwfix like the plague

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Vass