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moocher
mespilus
bluehuw
You kind of owe it to yourself to attempt to determine where the damp course is in your property, as it will maintain your sanity, and reduce stress levels.
Let's be optimistic and say the likely efflorescence pictured above is on bricks that are underneath the damp course.
You can pretty much ignore it, as damp induced effects on brick/blockwork beneath a functioning damp course will not spread to the brickwork above the damp course.
The rafter on the left hand side appears to be seated on a tile,
certainly the colour is unlike most bricks and the sharpness of the edges and corner in unlike any *brick I have seen.
This could be your physical damp course, as a ceramic tile will not transmit moisture from the brickwork beneath to the susceptible timber rafter.
If you can find another rafter that is similarly bedded upon a ceramic tile you can begin to expect that your property was built by craftsmen with adequate supervision,
and, at least internally has a physical damp course.
[*Other bricks are available. IANABE.
I am not a not a brick expert].