Part of my flat always feels colder and damper than the rest. It has no
cavity in the walls and they always feel cold. I don't have any rising
damp, but there was some penetrating damp last year until I discovered where
it came from, and the walls pretty much dried out. But it still feels sort
of clammy in there. I was wondering about hiring the kit and injecting the
walls with that fluid (whatever it is). Would it likely help, or should I
forget the idea?

Thanks

John