Self installs are only offered if there has been a service in use at the property in the last few years.
The sockets are VM property & should not be removed, however if the previous occupant was not a Virgin customer or was & then changed provider they may have removed it.
Check on you outside wall for an omni-box which terminates the cable from the street. If this is also missing it gets even more complicated as a repull back to the street cabinet will be required, causing further delays. Omni-boxes are usually brown (as below) but older ones may be grey.
Virgin brown omnibox
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Hi Jack I didn't reply as I was not sure if you were actually a forum team member (as your profile says you have retired, you joined on the same day as you replied to me, and have not made many other posts)
Welcome to the Community and thank you for posting.
I am sorry to hear you have not been able to complete your installation due to there not being a socket.
Was there a socket there previously that has been removed?
Unfortunately i have been unable to access your account via the community details but could you please confirm if you have arranged a technician to visit and install the equipment? If not, please do let us know and we will get this arranged from here.