London has some of the finest venues in the UK, many with spectacular views over the city - especially at night.
Many of these venue have conference rooms so you can have your meeting away from the background noise.
These would also make great venue to run networking workshops.

The Eight Members Club has two London venues, one in Moorgate and the other in Bank. Both have conference rooms for up to 30 people.

The Shard also has some amazing places to meet and has easy access to the Underground network and London Bridge station. Guests that have come a long way can stay in the luxurious, 5-Star, Shangri-La hotel on floors 35 to 50. And if by some chance they get bored with that they can visit the observation deck on floors 69 and 72.

The Forge at Cornhill has two floors, the ground floor is at street level and is normally quite busy, but if you go down the stairs there is a vast sub-level area which is away from the noise and is the perfect place for demos, networking or just to have a quite chat with friends.