Thank you all.
On balance I suspect the damp issues do in fact relate to condensation. The vast majority of affected areas are not sun exposed and, given the house is unoccupied over winter, I suspect lack of ventilation/heating/humidity-management is the issue. While the property is wind and rain exposed, so is the entire West Irish Atlantic coast so I guess I shouldn't read too much into that.
A reputable local company has surveyed and estimated a reasonable price to insulate the loft/eaves space of this dormer bungalow. All elevations have a 3 inch cavity for which they recommend Envirobead, a bonded bead product. Again this seems a reasonable suggestion; the product is government grant-scheme recognized and the surveyor recommends retrofitting trickle vents to the double glazing to ensure the property can breathe.
1. Is there anything else I should consider?
2. Other than water ingress, what other problems with bonded bead CWI might I ask about?
Thanks!