The "Delay" figure is a specific addition to latency that the Openreach DLM adds when it turns on interleaving. 8ms is the minimum value it gives.
Your interleaving depth isn't particularly high for an FTTC connection.
It's interesting that it looks like you are on a Huawei cabinet. Most, if not all, of these now have downstream G.INP, which basically replaces interleaving for most lines. If your modem doesn't support G.INP then you need one that does. Your connection speed would also improve considerably.
What is this Technicolor modem you have? I get the feeling it isn't a Plusnet one.
Ah! TG589vn v3. Is there a firmware update for it?
Routing from the cabinet also varies on FTTC. Quite a few have the broadband going to a different "headend" exchange from the one the phone goes to. That exchange can have a completely different routing to your ISP, (I think you are on Plusnet), and as such the latency can be several ms different. Even before taking the interleaving 8ms into account.
If you say which exchange and cabinet number you are on, someone will know if this is the case. The fact both ISPs have the same problem on FTTC, but the new one doesn't on ADSL2+ suggests to me it may be.
Edited by RobertoS (Fri 19-Jun-15 14:06:35)