Place to safely park my bike in London (UK)

[arnehulstein]

Hey guys, I am heading up to LeWeb'13 in London on the 5th and 6th of June. I was thinking I would head up there on the 4th, head back on the 7th and I need a place to stay, but also a place to safely park the bike while I am in London.

Any thoughts, places, ideas, offers appreciated!