Live video stream - 2 way

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Hi

We're planning 2 big events in December and we want to have live HQ video stream between 2 venues.

One is going to be in London and the other one in Manchester, Leeds or Birmingham (we're not sure yet).
We've been quoted £10,000 per day/session (few hours) from a company that will bring their vans with satellite dishes and establish a satellite link between the 2 venues.

I wanted to do some research and see if we can get something a little bit cheaper maybe but I'm not sure what I should be looking for (as in what's such service called). Are there any companies that will be able to set up a high speed connection on demand for 2 days?

Both events will be taking place in Hilton hotels so we need to roll our own infrastructure to get the high-speed links.

Any advice?