I'm in the TS4 area and have the exact same problem.
Been going on for the past week, I play a lot of online games and in those it's showing as lag spikes and dropped packets. It seems to be a problem with the gateway we're on possibly.
Tracing route to
www.bbc.net.uk [212.58.253.67]
over a maximum of 30 hops:
1 1 ms 1 ms <1 ms DD-WRT [192.168.1.1]
2 16 ms 6 ms 6 ms 10.26.128.1
3 7 ms 8 ms 26 ms midd-t2cam1-b-ge87.network.virginmedia.net [213.106.239.253]
4 6 ms 33 ms 7 ms midd-t3core-1b-ae1-0.network.virginmedia.net [195.182.176.113]
5 16 ms 17 ms 16 ms man-bb-b-so-310-0.network.virginmedia.net [213.105.75.49]
6 15 ms 34 ms 16 ms man-bb-a-ae0-0.network.virginmedia.net [62.253.187.177]
7 25 ms 22 ms 24 ms gfd-bb-b-so-200-0.network.virginmedia.net [62.252.192.94]
8 23 ms 26 ms 26 ms redb-ic-1-as0-0.network.virginmedia.net [62.253.185.78]
9 27 ms 23 ms 37 ms 212.58.239.249
10 23 ms 24 ms 24 ms 212.58.238.133
11 19 ms 21 ms 19 ms te12-1.hsw0.cwwtf.bbc.co.uk [212.58.239.222]
12 21 ms 23 ms 20 ms www-vip.cwwtf.bbc.co.uk [212.58.253.67]
Trace complete.
I'm on the bell to Vmedia at the moment I'll let you know how it goes, I'm also on 20mb.