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Mark wrote:
JK typed:

You could get some tell-tales / crack monitors from York Survey,
stick them across the gap, and photograph them every couple of weeks
for six months. The other thing you should do is to look at the wall
from the neighbour's side, and preferably put tell-tales on that
side too. If the crack goes right through the wall and is moving,
that is a Bad Sign

That sounds like a good idea. Presumably one sets up a standard
position for the camera?

You can check for continuing movement by gluing a small piece of glass
(microscope glass slide is ideal), across the crack, use a large blob of
tile adhesive on the ends of the glass only.
If it breaks within a week start to worry, and call everybody
worry less as time goes by without it breaking. !

I have a crack in my loft near the chimney that's about 1ins wide.
Its got a piece of glass across it that I attached when I first bought the
house.
30 years ago still not broke.

York Survey charge 4 quid for a crack monitor with a nice graticule, but
over 8 quid for postage! Still worth it though I reckon as it would
allow detailed monitoring over time.