my Choisya has white patches!

Help! My Choisya has awful white patches all over the stems and backs of the leaves about 1.2cm long x 3mm wide with a brownish blob on each patch. See photos. Does anyone know what this is and how to cure it?
many thanks.
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I've only ever had to deal with a few of them which I simply wipe off and squish.
https://www.rhs.org.uk/advice/profile?PID=224
RHS advice in the link above. Good luck getting rid of them.
Hi Kitty
Thank you, I'll take a look at that link. I'm going to give the plant a prune anyway so I'll hopefully be able to get rid of some of them that way.
Best wishes