Have they still not sorted that glitch out !!
Same for me - first page on the website says "great 1GB is available" - and then when you go past there to try and order it - then the max is 500.
I suspect that unless it lets you order it on the web or your account or on the phone - then its not available in your postcode.
A VM person should take a look for you when they get here in a day or so
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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 2 WiFi,) SH2 in modem mode with Airport Extreme Router +2 Airport Express's. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.