I'm with Irish Ago - to a point! You'll find 650 twins at every club series in the country and the Moto450/GP45 thing is beginning to take off al over the world. The potential for manufacturer involvement in a 450 class is huge - nearly all manfucaturers do a 450 - and they look & sound like proper race bikes. They also might be cost effective enough that dealer teams might be tempted back!

My ideal would be something similar to the Manx in that I'd have a Lightweight TT in 3 classes: 250GP, 650 Twin, Moto450/GP45. Wins awarded for best in each class.

Use the post-race practice sessions and run it as a 3 lapper on the morning of the Senior.

I know Paul Philips doesn't feel this way but I see no reason why we have to have fundamentally the same grid of riders for EVERY solo race - it starts getting a bit like Groundhog Day by mid week! There are riders that go well on smaller machines who perhaps aren't so good on bigger stuff. There will also be riders who might fancy the TT on a smaller machine and have no interest in racing something bigger. Besides introducing variety in machine classes I don't think some variety in riders would hurt either...

I'm quite sure with the above class structure you'd get a decent sized grid. There are top flight TT riders already involved in those classes and I'm also quite sure it would prove popular with true TT fans and provide an incentive for people to stick around a bit longer instead of clearing off by the Tuesady of race week.