Thanks for all the replies.
Mostly only use this connection for gaming, hence why care more about latency then speed for the most part.
So there is nothing that can be done about it?
Something can be done which may work. On certain modems it is possible to limit the max sync speed which may persuade DLM to remove interleaving. On a Billion or Zyxel the command would be ................. adsl configure --maxDataRate
I am using the new bt smart hub if that helps with the last point?
The day the service went live the latency was a lot better, is that because interleaving was off?
The BT Smart Hub doesn't offer that facility. The modems I mentioned do - Billion or Zyxel, some of them anyway.
Yes, initially DLM isn't active and the line is set to fastpath. As soon as DLM intervened, it applied interleaving. One way to get it re-set to fastpath is to have DLM reset, but this can only be requested by an engineer. Another way is to restrict max sync in the hope of fooling DLM into re-applying fastpath.