Ah, Mrrzy - you have a misunderstanding there. 'Shuttering' is not part of a verb - a shutter is something against which you pour concrete, shuttering is all the shutters together.

Now if you'd said the jam of the shuttering was a malfunction, it would have been another interpretation.

And before any other pedantic construction worker picks me up - I know that you don't pour concrete - you place it.

Greg - you're probably right, but I doubt that anyone on a construction site would know that. Well, maybe a quantity surveyor!

Phil