Cracks in ceiling coving - cause for concern?

[rusholme]

Hi,
Just had an offer accepted on a 1930s semi, but have noticed a number of cracks in the plaster ceiling coving in the downstairs dining room and lounge. The cracks are no more than 1mm wide.

See pics.
No visible cracks in interior walls (although it is wall- papered) nor around doors/windows. External brickwork looks sound, with no visible cracks. Is this anything to be concerned about?
A surveyor is visiting the property next week but would be intetested on your thoughts?

 

[noseall]

As winter turns to spring and particularly when the first warm dry spell occurs, cracks appear. Its also efflorescence season too.