I get the point that it wont be a perfect match but one can only try.
I suppose all im really trying to understand is how they got the colour of the original scratch coat which hasn't been weathered as per photo - would it likely have ben white or silver sand? seems to much 'ight grey' to...
This is driving me nuts so will just start by saying f*** sake!!
Trying to patch repair this with 5:1 sand:cement (building or plastering sand).
That's mostly the original scratch coat in the photo, i've patched it in at bottom left area.
I've got the canterbury spar stones already.