tried a traceroute to 2 of the testers, TBB and broadbandspeedchecker.co.uk.
Interestingly the route to the TBB tester was done in 9 hops and each was below 100ms and on average below 50. The broadbandspeedchecker test server, hosted by amazon was hosted in the US and the hop time increased significantly once it had crossed the pond, and timed out on hop 15..
I'm struggling to find the actual test servers used by some of the other more popular test sites.
The O2 support guy gave me a url for be* server, I must find the paper that was written on...