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The Natural Philosopher

wrote:
clearly I like the sound of this, what sort of price are we talking?

I must admit though all of the above ideas are the accumualted
knowledge I have got mainly from posting on here - the common theme
being "damp proof course isn't failing, concrete floor the cause, sort
the problem and don't waste money on more injecting etc..."

You have been listening to people who have read something on period
homes, haven't understood it, and think they know everything.

I think I'd be convinced by your argument if there werent the random
patches of damp - can the DPC fail in intermittenly in various
different areas.

Yes. if injected.

also the main area of damp is in an internal partition wall, would this
have even had a DPC?

Thats the issue. On my house I had the same, and the primary reason was
they injected from outside, and made a DPC that way - the original had
none - but they simply didn't DO the internal walls

In my case the problem was worst where the floors were wood. The main
reason for that was water was collecting under the suspended floors.
Where they had laid concrete on a DPC it didn't even get under the house
at all.

An internal wall is a good candidate for injection, but you have to go
low and deep. Or skirtings will rot.