The best way to tell is to try and order on the website - if you can its available.
I got notification that Gig1 was available in my area - when I check the Max speed available was 5/600.
I "think" that is because VM "Areas" are not "geographic" - I am Area 20 in Manchester - as are othe customers in London/Bristol/etc .... they are "legacy" billing areas from your previous company pre-VM - and the VM website is notoriously "average".
--------------------
John
--------------------
I do not work for VM. My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired 2 WiFi,) SH2 in modem mode with Airport Extreme Router +2 Airport Express's. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.