Isnt the point...
... that the internet is a distributed network where packets will route via whatever routes are available?
Doesn't this mean that either:
a) 100% of traffic for these providers can ONLY route via the link on the docklands (ie: no other routes physically exist... which surely would be strange for large providers to have no backup links)
or
b) something is really screwed up with IP in the UK (IP as in TCP/IP ... not intellectual property)
Paris - because dockland workers are a big fan of hers.