Stair crack in external brickwork

[Taylorewan]

Hi,

Writing re: my property, which is about 25 years old. Photos attached. Also attached a zoomed out photo of the house so you can see the bigger picture

I have noticed a stair case crack in the mortar above this window. Leads from the top corner of the window to the left.

One really tiny vertical crack to the left of the window leading down to the dpc, doesn't go down any further. Really need to get on hands and knees to see it. But now I've seen it, I can't unsee it.

No cracks indoors, all windows/doors close perfectly.

Would appreciate any advice before i call a structural engineer out

Many thanks

 

[^woody^]

Are the internal walls plasterboard? May be from that age, and if so movement would be hidden.

The downwards movement of the wall may indicate more than just thermal cracking, so let your engineer investigate.