As issue seems to be either PC or at TT's end, the former is more likely otherwise lots of TT users would be reporting this issue. Therefore I think we ought to revisit MTU. Earlier values seem rather small.
Taking the simple sledgehammer approach, worth trying MTU = 1492 and 1500.
1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 20 Meg WBC
Yes lower the MTU on your router!! Your wasting time doing traceroutes etc. The reason the signal booster works is because the vpn it establishes will be using a lowetr mtu as they are used to dealing with BT connections.
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MTU seems to have made some improvement but I've also had to switch back to the Zyxel to do it. The setting was refusing to take on the technicolor... hopefully the Zyxel holds out.
(Improvement with websites obv ukmail is simply some routing cock up)