If possible can you get other images without the " Brown Curtain?? Corrugated sheet??" in the shot? + an Image from a bit further back to enable an overview.
As for what can be seen so far, areas of pointing appear to have been replaced some time ago?
I wouldn't be concerned. Rake out to an inch deep and repoint.
Minimum bond on stretcher bond is 1/4 brick, you're on the limit and if the joints weren't fully filled and compacted, hence the cracking, so just repoint.
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