You can post up some photos of the sockets you do have, if you want. Forum members can then comment if any might be suitable.
If your flat is a new build/high rise the internal cabling in the building may need connecting at a central comm's cupboard.
For flat conversion properties or older installations, sometimes there is no wall box, just a trailing cable. The cable could be hidden within, or behind, furniture. Occasionally only a very short stub of wire is left behind often hidden within a blanked-off fitting. The wall box may be branded with the logos of an old cable TV company (not VM). Past occupiers of your property may have removed the cable and sometimes they are removed by other installers, such as satellite TV techs.
If you have a plastic omnibox outside on the wall (where the VM cable comes in from the street) see if you can trace any wires from that into your home.
