Ok, well, firstly, you can`t call it a teknival unless it is one, which it isn`t.
Teknival = Free, open rig policy, non commercial, anti authority.

So what you are proposing is a festival.

I`m all for it, but, an event of 50,000 is unlikely, not for free.
Cos you need security, a lot of it, and you are looking at about 60-100 quid per guard, per day, and roughly 100 guards.

That`s basic off the cuff figures.

Licensing, is the most important.

Exodus set the precedent for running the first free, legal festival, and getting a license, especially for a real big event is virtually impossible without masses of cash, various residents and council permissions etc.

I`d like to talk about it, but I don`t think techno alone can support something this large in this country.

However something a bit smaller and more realistic, with maybe 10, 000 max capacity, is more manageable.