My ISP is Zen Internet.
The thing to remember is, I've substituted another router *directly* in place of the Draytek. If the Openreach modem or line was at fault, the substitute router would also exhibit the problem.
The substitute router is a cheap TP-Link £35 router.... and the speed test sits beautifully at around 75mbps hardly wavering.
I'm at a loss. I generally know what I'm doing with all this; I've been a freelance software engineer for nearly 18 years, and I've written firmware in C for proprietary tracking devices (which was a challenge back in 2003!). Just trying to get across that generally when it comes to technical stuff and testing, I know what I'm doing.. I hope
But I still can't make a Draytek router work at full speed