Also on 900/900 and looking forward to 2.5, your message prompted me to run an Ookla speedtest,on the desktop, which revealed that my pint has reduced to 7 from 11, connecting via Manchester..
I find that the speedtest servers based in Manchester are hit-and-miss whether they will give you a lower ping when routing through Manchester.
Exascale is generally good and I get between 7 and 9. IDS I get 20 (which makes me think the route is me in the south to Manchester, back to London and then back to Manchester again).
Zen in London I get 13ms usually and very often a much lower speed than I'd expect when terminating at a Zen run server.