SWC

What's the bit of kit on the second photo, some kind of skid? Or have the tracks sunk? Looks rather useful

I'll vouch for the damp newspaper dipped in some ash from the burner. The ash acts like a mild abrasive and there is something in the newspaper ink that brings a nice polish.

Maybe a stupid question but what would run off a pile of Chip to contaminate a watercourse?

Here Here

The chipper attachment seemed to struggle even with the straight length of 2x2