Ok, if you are experiencing congestion then a different provider may work. However if you go with sky you may not be able to use that router directly. You should be ok with it on talktalk though.
If you went with AAISP they may be able to throw some light on what's happening.
You would stay on the same cabinet, no idea about the other bit.
Also with sky you would not be able to use your own router, as Sky will not tell you the login details, although it is apparently possible to extract them from the sky router.
Also with sky you would not be able to use your own router, as Sky will not tell you the login details, although it is apparently possible to extract them from the sky router.
You also need a router that does the unusual DHCP, the majority do not work.
JamesBT Infinity 2 19/09/2012 - Sold 42/6 - Getting 46/10 - Sync 54 / 11 Mbps @ 470m approx 14 years of broadband (ntl: cable to BT FTTC) - Router: Asus RT-N66U - Modem: Huawei HG612 speedtest
Those graphs are not going to help with diagnosing speed drops in the evening, the daily graphs (ongoing_stats) might show a bit more info, but ideally you should set up a ping monitor, you'll need a static IP for this, or need to update it each time it changes, which is not recommended.
The most likely cause is congestion somewhere in the network.