Thanks for posting and I'm really sorry to hear of the slow speeds that you have been experiencing. We will certainly look into this with you.
I've run a few checks and I can see that there is a fault ticket that's been raised causing slow speeds around peak times. This fault is under reference F002989284 with a review date estimated for 23/03/2016. When checking your hub there are also problems with your dowsntream power levels that will exacerbate this type of problem. We will need to arrange an engineer visit to get these levels adjusted so I'll send you a PM.
I can concur that the evening VM broadband speeds in W3 have been unusable for 95.9% of every evening for circa the last two weeks. (I also have no landline at all. Same time frame.) An eta for both fixes would be appreciated.
I have just WhatsApp'd a W3 group and have reports of the same ranging right across the area e.g. W3 6HB, W3 6EX, W3 6EY and W3 6HR.
Perhaps this is a different fault from F002989284 in 2016 an 2015..?
Come on - let's not give London the most mediocre broadband speed in Europe!