A final follow up to say that I was successful in getting the MAC from BT this morning, with an apology for the fact it was overdue. Seems I got the ball rolling . As far as I can tell it's a valid MAC for FTTC (starts with OGEA).
I will signup with Zen Internet shortly.
How did it goes with Zen FTTC? Also can you post back BT Performance Test to see if Zen does have minimum speed range should be around 60Mbps instead of 40Mbps
Apologies for the delayed reply.
Ordering process went fine, no issues at all. Was activated around 2am on the date that the they said it would activate on. Only problem I'm having is with BT Business, they emailed me to say that the old service would be ceased, and it wasn't. I ended up being charged a full month instead of getting a final bill as the email said. BT Business promise to refund me the partial amount that's due and say they've ceased it but it will take a few working days to process. To be on the safe side I've now cancelled all direct debits with BT, as I'm also with Zen for the voice service/line rental now. So, could well be a few weeks of chasing BT Business up for the partial refund I expect.
As for speed, although take up on the cabinet seems to have increased, therefore dropping my attainable, DLM has speed banded me on 74/20. Attached screenshot is my BT Wholesale result. I'm connected to an ECI cabinet using an unlocked ECI /r modem, I think around less than 300m away based on an attenuation calculation at 1MHz~ I did a while back (but don't hold me to that, I may be remembering wrong). All LAN cables are cat 6a, ASUS RT-AC68U and ASUS RT-N66U (one serves LAN IP's only, the other serves public IP's from the block I have with Zen), MK2 SSFP and ADSLNation 0.5m DSL cable. Suffice to say I've not been cheap on any bit of the network in the house
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BT Wholesale Results:
http://i.imgur.com/wExyW5d.png (Downstream minimum range of 57.3Mbps corresponds correctly to my current downstream sync 74Mbps)
Speedtest.net Results:
http://www.speedtest.net/result/3710576923.png (Eastbourne is the city that I'm in so I always usually run a speed test on that option on the map)
One last thing, the upload speed is slightly lower than usual (nearer 18Mbps normally) because I'm hosting some Team Fortress 2 servers here, and they're currently busy at the time of posting this message.