Cob Re.cob fireplace

[Rog]

> Hi cobbers

Greetings cobber.
Which poses a question:  Where does the phrase "You're nicked, Cobber" (as
seen in The Bill) come from?  Hmmm...

> It turned out that the inner layer was too weak, couldn't stand up to
being
> bumped into with wood etc. . So I suggest firebrick for the lining and
cob
> your heart out all around it!

Ah, I see.  That sounds like wisdom.
What would your opinion be on an inner layer (or perhaps entire thing) made
with a mix of concrete, say ten or fifteen percent?  Would this up the
strength sufficiently?

Cheers, Rog.