@ Chrysalis,
However there are others on long lines and also long distances from the associated, but secret DP number, where the BT Wholesale estimator grossly exaggerates the estimated speed**. I expect we are the exception to the rule at present as there are comparatively few semi-rural FTTC services available. However this will change as the Local Authorities have awarded contracts to BT to provide some FTTC services but I suspect that, as many LAs include down to 2 Mbps asymmetric as Superfast, it is recognised that the rural success rate could be very much lower.
** Our worst example is at a location with three xDSL lines of about 2.25 km D side length. All were estimated to achieve a quite impossible 19 Mbps VDSL service. Fearing the worst we only installed one VDSL service which miraculously achieved 1.8 Mbps as one of the first on the FTTC. That has now dropped to 0.68 Mbps which, unsurprisingly, is lower than the other two ADSL services achieve on exchange lengths of nearly 6 km. We did try to get some improvement but to no avail. The estimator was, presumably manually, adjusted to 1 Mbps; HOWEVER the estimator STILL offers 19 Mbps for the other two. Even the latest downward adjustments have not reduced the figure from 19 Mbps.
I believe BS hinted that a revised estimator algorithm is being considered.
Kind regards,
Walter