The Hub 4 is only available in areas that have been upgraded to the DOCSIS 3.1 standard (about 30% of VM's UK network), and even then you'll only get one if you subscribe to the pricey Gig1 service, or if you live in an area subject to recognised network congestion. In any qualifying case you'd almost certainly have been on the list of people to have the Hub 4 or Gug1 service pushed in their direction.
But why do you want one? Plenty of teething problems being reported with the Hub 4, the wifi doesn't appear materially better, and if your connection has power or noise problems now, a Hub 4 won't solve those.
On the other hand if this is about "shiney......neww...must...have...latest", then try phoning up and see if they'll give you one.
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DOCSIS 3.1 and the Gig1 product will be available to all by the end of 2021. I expect that customers in selective areas will continue to be offered the hub 4 as a cheap way of resolving contention issues.