Can anybody recommend an ISP with coverage in central London (specifically Leicester Square area) that can provide connections via a wireless link? (Not satellite, as this would require an external dish).

My company is moving to new services office and their internet provision is rather expensive.

 

Get a good aerial and you'll have a choice. I used BT openzone in Central London for a week 24/7 with no problems. It was a telephone box outside Liverpool St station. A week's access wasn't all that expensive either.

 

It's for permanent use 24/7 rather than occasional use from a laptop.
I'm looking for a realistic alternative to cable, ADSL or satellite.

 

BT do some buisness plans, probably worth calling them.