> mentioned Telehouse Docklands hosts LINX so you can get an unlimited transfer gigabit right into the Internet backbone
First, look at the LINX network map. They are not just in Telehouse Docklands.
Second, with all due respect, do you know anything about how the internet works ? "internet backbone" huh ?
LINX is a peering exchange. A connection to LINX gets you nothing. Sure you can peer with the route servers. But you won't find any Tier 1 routes on the route servers, and the Tier 1s will also refuse to peer with you because you're too small or you don't meet their ultra-restrictive peering policies (for example, good luck getting BT to peer with you !).
Most people are better off getting a good connection to either a Tier 1 or a high-quality Tier 2 network and leaving it at that.
> Also there is a cluster of data centers in docklands so they compete on price heavily
London Docklands is the most expensive place in the UK to colocate, and probably in the Top 5 most expensive globally. Its prime real estate, all of the big-name colo facilities know that and will charge you accordingly, ESPECIALLY Telehouse !
And trust me, you don't want to go anywhere near a "cheap" Docklands facility, they are cheap for a reason.
The days of £300 a month for a full rack in Docklands are long gone my friend.
There are many other perfectly good places both in the Greater London area and elsewhere in the UK and Europe where you will get more bang for your buck.