I'm also in area 20 and having the same problem. During peak times I'm only getting around 2-3mbps, sometimes even less. It seems fine the rest of the time so I assume this is due to oversubscription? How soon is this likely to be resolved?
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.(F004865922). Our technicians are working to get this resolved and have set a review date of 8th March 2017.
I'm really sorry for any inconvenience this may cause.
All the best
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