Really sorry to hear you're experiencing speed issues.
I've located your account and I can see an issue with the network in your area affecting speeds at peak times - Ref.(F003733181). Our technicians are working to get this resolved and have set a review date of 28th June 2017.
I'm really sorry for any inconvenience this may cause.
All the best
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A "review" is exactly that. Apparently the engineers get together and evaluate the work that's been carried out to assess whether further improvements are needed ... or something like that. In practice it occasionally results in a "fix" — the last one in my area lasted three months before going faulty again — but mostly it results in absolutely nothing getting done. For example, the fault affecting me began in October 2015, was last "reviewed" in March 2017 and won't be "reviewed" until December 2017 by which time I hope that BT will have installed more fibre capacity in my area and I'll be long gone.
"Cable broadband is typically faster than copper-based services, but a significant minority of users experience severe slowdowns in peak times." — Ofcom, UK Home Broadband Performance, November 2016
I am based in Area 21 and have the same issue for last 5 months minimum.
Broadband is super slow and download speed is less than10mb often and peak time (evening/weekend) is less than 5mb, which is not useable.
I have signed up for 50mb max, while I understand this is 'max' speed and not guaranteed. But having constant low speed less than 10 for 90% percent of time which is connected is unacceptable. I cannot do any streaming (spotify/Sonos connection) is dreadful, just cannot even watch 10 min youtube without downloading up-front.
I changed a signal channel and rebooted a rooter, tried everything which was suggested to improve the speed, this doesn't change the situation.