crack in external wall and hairline plaster cracks

Hi

I have lived in my 1930' property for around 3 years. I have noticed cracking in the plaster in a number of areas. Mainly 1 side of the house (south facing) all hairline cracks and according to Google these are usually normal and mainly cosmetic. I have also noticed a couple of bricks on the external wall that have cracked and also the pointing looks cracked. There is a hairline crack behind the radiator that is in the same area as the crack in the external wall is this likely to be related?

Please see images below.

https://photos.app.goo.gl/KD1STxo4SjxbdMbp8

Does this look anything to worry about? I have shown trades men and family and they have advised nothing to worry about and usual in an old property. I believe it is clay soil in the area.

Nothing came up on surveyors report that would be a cause for concern.

Thanks

 

Thanks Jim, the stone on externall wall also has the odd crack is this possible due to old age?

 

Thanks Jim. @Abrickie there is an extension on this side of the property just one storey. And I believe the old cast iron gutter will of been where the cracked stone is. Thanks for all your help!