Thanks again for all the advice/tips.
I've spent a lot of time today trying to get to the bottom of things and comparing suppliers. What I've found out is that our cabinet went live in August 2015, after we'd signed up for a 12 month phone and ADSL package. We're now out of contract, so can go with anyone.
I've re-verified that there is capacity in the cabinet, so we can get FTTC OK. I then rang our supplier to ask why they can't give us fibre, as they offer a fibre package and our username log in includes the words "btbroadbandcomplete.com", which implies that they are reselling services from BT Wholesale. What I got from our current ISP was an odd answer. Apparently, they can only offer fibre if the local exchange is unbundled. I've not heard of this before, but can't see a logical reason why the exchange being LLU'd should make any difference to a FTTC connection.
My very friendly Openreach chap has confirmed that they are not going to unbundle the exchange now (its a very small rural exchange) as they've put in a fibre cabinet, which negates the need to LLU the exchange in their view.
With thanks to those here that have posted useful info, I'm now trying to put together a spreadsheet to compare line rental costs, call costs and ISP FTTC costs from various suppliers, to try and see where the best balance of speed, customer service and overall cost, lies. One thing that sticks out is that some ISPs charge a fairly hefty up-front installation cost, even when you tell them you already have an FTTC capable NTE5 Mk3 box and modem/router, so have no need for an engineer visit or any hardware from them.
I suspect this is going to take me a fair few hours to wade through, as it seems that ISPs just don't want consumers to be able to make direct comparisons.
Following the above debate about BT getting priority, I can confirm that four suppliers have told me that they cannot offer us FTTC as the cabinet is full. Even when I point out that Openreach and BT Wholesale are adamant that there is spare capacity, they have all told me that the reality is that cabinet is full. I've double checked with the Openreach guy, and he told me this morning that when he last looked around a week ago the cabinet was only about half full, plus he said there is an extension rack already in the cabinet so if need be they can plug in extra DSLAMs to get more capacity than there are residents in the village!
As far as I can tell, the less well-known suppliers do seem to offer more flexible deals, and, from the very useful comparison on here, seem to offer good customer service.
Thanks again,
Jeremy
Edited by deleted (Mon 24-Oct-16 16:55:00)