I don't know, personally I think if this race gets off the ground, the Manchester idea will be quietly dropped and Champcars will attach themselves to this event instead (and vice versa if there's a problem with Brum)
I personally can't envisage TWO street races in Britain in 2006 (or even THREE if the F1 London thing comes off...ha ha, yeah right), great though that'd be!
One would be more than enough though, and if they could model it on the Surfers Paradise street race in Australia (where pretty much every championship in the country used to get a round, before it all went pear shaped), we could have everything from Champcars to BTCC, F3 down to Clio's and FBMW's on the streets of Brum...what an event that'd be!