Interxion's data centres in the City campus (LON1, LON2, LON3 and Oliver's Yard) are all interconnected with redundant dark fibre. It is possible to connect between any of the data centes with a standard cross connect.
There is also a pre-installed Metro Connect solution connecting to Interxion's Docklands Campus (Sovereign House, Sovereign House North and Cloud House) providing redundant dark fibre and 10G and 100G connections between the campuses.