On Wed, 21 Oct 2015 17:44:01 +0100, GB wrote:

Lorries on pavement - they've just demolished a house in my road.
Massive lorries were driven onto the site for the rubble. To avoid dust,
the contractors sprayed the rubble with water (all weekend!), but this
no doubt added to the weight.

Not significantly. A big pile of bricks is going to weigh about the same
whether they're damp or dry.

The pavement is now massively chewed up, and I saw the lorries doing
this.

And Building Control will have noted it, too.

The contractors have now left this with an old wooden door over the
hole.

So it is currently temporarily made safe?

I can contact my council to report the damage, so they will repair it
(eventually), but really the demolition contractors ought to pay for it,
surely? What is their responsibility, and how should I deal with this?

Yes, they should. Or, rather, the council will fix it and send the
contractors the bill. Which is what is almost certainly going to happen
anyway, just... in council time.