I am no expert but I have see it posted here that "NaN's" does mean they are waiting for permission from the local council to dig up the street/pavement. That can take a few weeks or months depending on your council.
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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.