as LittleMick73 said, Virgin Media network is a cable/docsis system were as BT is ADSL/telephone network system, can wait for the forum staff to reply or could give pre-install team a call 0800 052 1734, would also check the cupboards, under the stairs etc..
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Just signed up with virgin fibre broadband. The virgin cable doesn't fit my bt wall socket. How can this be rectified?
if they have allowed a self install then VM has been installed there in the past - they dont remove it but someone might have removed some of it
start outside and look for the external wall box - 6" square ish usually on wall facing road or pavement - brown or grey usually - follow any cables that come from it and go inside - if there are non look inside opposite external box as they may just have drilled through wall - as said it may just be a cable rather than an internal wall box