The phone provider is responsible for the line to the house and a master socket on the end of the phone line.
The traditional master socket contains several extra components: a ringing capacitor (now largely unnecessary for modern phones), a surge arrestor (to protect against voltage spikes on the line) and a test resistor (to allow remote tests to be run on the line). BT have modified this design over time for changes in broadband connection/type over the phone line. Doubt VM will have done so as no broadband is carried on the phone line. VM's T&Cs preclude customers making any changes to VM's equipment (phone cabling up to and inc. the master phone socket and any coax cabling/wall boxes). You can, however, fit your own phone extensions from the master socket.
The master socket has a removable faceplate at the bottom. The customer can connect extension sockets from the faceplate. The faceplate can be removed which also disconnects the extension sockets from the master socket. The purpose of this is for fault finding in case extension sockets (the responsibility of the customer) are causing a fault on the line.
If you happen to have a collection of jelly crimps, spare external grade phone wire and a master socket etc. hanging around, then I guess you could save yourself some money via a DIY approach. If not, and you have to buy this stuff, then you could be well on your way to spending the £25 for the VM fee to get a master socket fitted where you want it. Also if VM do the installation you won't have to explain any DIY work in the future if that ever became an issue.
Worth noting that, at some point before 2025, everyone will be moving to a phone connection from the back of the hub in which case your phone wiring will become redundant. I think I read a comment on here from one of the forum team that VM’s target is actually the end of 2022. So, if hub placement, as well as phone placement, has any relevance then you might want to factor that in too as part of any wiring changes.
If it was me, I'd pay VM the £25 to put a new single master socket where you want it. You can then remove all the redundant extension wiring at your leisure.