There are globally loads of silicon shortages. the current SNAFU around the EU trade agreement makes the UK hard to deal with, so we get a double hit with shortages.
Some of the shortages in the supply chains are due to all the shite that's gone on in the last year, both due to supply chain capacity, and due to a higher demand for them from both consumer and the datacenter.
This is already on top of a pre batflu, pre Brexit shortage of (particularly Intel) CPUs, which have driven demand for AMD shite, and for GPUs which are being used more for their processing capabilities more than their screen outputs in all sorts of industries. Bit Barns are buy-in them up in bulk straight from the likes of AMD and nVidia in quantities that they can never make enough of them. Some popularist press like to blame bitcoin mining, but most GPUs going into that semi dark market are used for encryption cracking etc.