It all sounds very odd. I think you ought to ask Zen why it is so low. Though I would be checking the home wiring as much as possible before contacting them.

Has he fitted the interstitial filter plate?

I get far better connection speeds than you and am ~600m from the cabinet.

I usually sync at 48Mbps down and I am 800m from the cabinet...

Yep interstitial faceplate fitted. As I said, presume extension wiring is not causing issues as he seemed to compare performance just at junction box during the process of disconnecting all the other extensions and then making the one in my home office effectively the only one active.
Zen portal shows sync of 52853/10413, which has happened a few times on the install day and once yesterday but nothing since (and always the same rate).
The Zen supplied router was so flakey for wifi I got myself an Asus replacement which has been great.
The Openreach modem is ECI if that makes any odds. I don't notice any problems with the connection in a general sense. I guess if this is as good as it gets I should consider dropping to the 40/10 product.

Edited by Deft (Sun 16-Aug-15 08:03:02)

You should be asking Zen what is wrong! There almost certainly is, somewhere.

In reply to a post by Deft:

The Openreach modem is ECI if that makes any odds. I don't notice any problems with the connection in a general sense. I guess if this is as good as it gets I should consider dropping to the 40/10 product.

Do you know which flavour the cabinet is? If it's Huawei you might find that an unlocked HG612 with latest fw would enable G.INP and speed things up for you.

Yes self install you get the free router - if you need a master plate fitting they call out an engineer and then you get nothing but a ECI/HG612 Modem as I found out when I had to buy my own kit.

And still get stiffed on a 12 month contract.

I hadn't yet got around to querying it with Zen, but for fun re ran the BT phone number checker. My estimates have been updated in line with my current performance. Previously the clean estimate was 80-68 down and now it says 49-34. I guess that underground cabling is not great or something! That's a pretty significant revision.