is your flat serviced directly from the outside from a VM "Omnibox" attached on your outside wall - its usually brown or white plastic. If so... then trace where the cable from it comes into your flat - usually through a hole drilled through the wall. Search for evidence of connection on theinside of that hole. It may be "hidden", decorated over, or a previous tenant may have removed it.
Or is the whole "block" served from and internal VM distribution box?
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John
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I do not work for VM. My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired, 1 WiFi, 1 on PA) Hub5 in modem mode with Apple Airport Extreme Router +2 Airport Express's. On 250Mbps, Talk Anytime Phone, x2 Mobile SIM only iPhones.