6ms is impressive. The lowest I've seen so far.
Shame your ISP doubles it!
What length do you reckon your copper tail is? What's attenuation reported as? 
That isn't the ISP doubling it. Hop 4 will be at the bRAS location and before any core routing. Liverpool doesnt have a
core node, so most likely that will be somewhere like Manchester. As mentioned in my earlier post 6-7ms is typical to bRAS, its also not unusual to see several hops at the bRAS before it enters the core.
Hop 9 is exiting the core at Ealing.
Most BTw based ISPs except BTretail use L2TP tunnelling so that you never see any of the BTwholesale routing. Many years ago I did some trials for Plusnet's RIN network where they didnt use L2TP and I could see clearly from that I went through Manchester. There used to be
another way you could view your routing, but Im not sure if it works on 21CN - I havent tried it.
I find hop 5 quite interesting though and how things increase by 3ms - yet both hop4 and hop5 resolve to T-MAN (Metropolitan Access Node) but Ive no idea what a T-MAN is - searching throws up something to do with clusters & IPv6 and yet when I look at the next hop after it resolves to BT-UKIP-IPV4. If someone has more info on that please do enlighten
Im not sure if those particular routers in that cluster could even have low priority to ICMP as note how hop 8 has lower latency, which is typical of prioritising ICMP.
