Hi everyone, would really appreciate some views on the below pics to my untrained eye. Bit of background. It's a 1930s semi, the mortar in question was repointed before we took ownership in 2011, I'm guessing early 2000s. The crack runs only in the mortar from the downpipe near the bottom right of the window to the black vent in a zig-zag step fashion. This is the only crack in the mortar I can find having gone around the whole house and this is this part of the house that has been repointed - this side of the house gets the weather. The only reason I noticed it was a walkaround as we are selling the property. There's a very fine and small crack on the inside plaster that corresponds with the outside (I could be wrong). I can't be entirely sure if the hairline crack is new, but I don't believe they are as I really had to look for them. The survey we had in 2011 didn't pick up anything significant, apart from the house had some movement in the past but nothing recent and completely normal for a house of this age. My best guess is the newer mortar is cement based and the old mortar is lime based so less accommodating. So any reason to be concerned as I'd hate this to be an issue on sale.