Cuddling aggregate

Never ever ever lay concrete when it's cold.  By cold we mean temperature averaging below 5C over a three day period, and with no half day period being over 10C over a 7 day period.

But if you must then do things like cuddle your aggregate, use hot water and wrap it in a nice warm electric blanket.

But never lay concrete when it's freezing.

Anyway - whatever - we've laid the first part of the concrete foundations for a lean-to.  The forecast is it'll not freeze - and we've got it all wrapped up in slightly rotting hay so hopefully we'll be OK.  It's not as if the foundations need to carry lots of weight anyway.  And we're in a hurry.

If we've got it all wrong, instead of something hard we'll have something crumbly and we'll have to start again.  We'll know in a week or so.