[Si Coe]

I agree with Tony.
The new Bury track is all astro, and tyres last so much longer than the old track which had just a couple of paved corners.
I'll be running at Southport this weekend, and expect much worse tyre wear, and some scrapes on my chassis, thanks to their cobbled section.
That said the change of surface is quite good, so if you were going to do that I'd advise it to be a section that can be easily cut out when laying out the track so you can get the best of both worlds.