With British weather who knows what will happen, Friday night is too early to say anything really...but as I said before...the decision is now what it always has been...we're running on the grass!!!
Not only that, but we're all in the same boat set up wise.
Having said that...my B44.1 setup from Oswestry, which is an old skool grass track just like ours will be, was absolutely blinding last friday night at club!
And to be honest, I've been using basically the same setup indoor and out for our club tracks all year this year since the nationals started without any troubles.
Only thing I'd change at a push would be the gearing!
Remember, our indoor tracks aren't like anyone elses....they are practically outdoor offroad tracks with a roof on anyway So inthe unlikely event that it hoons it down all day on Sunday, you have nothing to worry about!