@peterts wrote:
I need a VM visit to set up the new fibre phone. There is a telephone cable socket next to the VM box so need this modifying to enable the new connection to the Hub.
When you mention 'the VM box' what are you referring to? The plastic 'Omnibox' outside or the hub inside or some other VM box.
In the 21CV phone connection, the phone plugs direct into the back of the VM hub. As per

Do you have additional extension sockets around the home that also need linking to the phone socket on the VM hub?
If you need a link making between the phone socket on the VM hub and a distant existing telephone socket, then VM should do that free of charge as part of the switchover process.