Damp on internal wall

[MattB83]

I'm in a 1950's brick house - there is a damp course which I believe was installed a long time ago. Recently we've had a blocked gutter, I was slow to sort and a couple of damp patches appeared at the bottom of some internal walls. Hoping that now the guttering is sorted the damp will resolve.

But there are a couple of patches at the bottom of interior walls (i.e. not connected to the outside wall). Could they also be caused by the guttering?

 

[Wayners]

Without eave supports supporting felt any water that gets under tiles can fall short and run down cavity.
Maybe gutter problems caused this?
Maybe you still have a problem with roof and water is running down felt and falling short of gutter.