Hi Phil

[...]
Just dig around it and replace[1] it with a new hopper, they cost about £20,
then backfill and relay the concrete / slabs / whatever.....3 hours work at
most, and this includes the journey to pick up the stuff.

Thanks for the suggestion ... it may come to that, but i'm looking for
a temporary fix to do tomorrow, prior to the sort of thing you
outline, to do in a few weeks time.

I'm now thinking of some sort of caulk... recommendations?

Ta
J