I have the same problem with no VM socket but got my delivery yesterday for self installation.
Do I need an engineer?
better to start your own thread as doing it this way your question can be missed but no matter
not all installs have an internal box
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
if you find a cable you need one of these to attach the cable that came with the quick start kit