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"C35A" for concrete strength in BS Code

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While I'm reading a job specification which is based on BS code,  

I'm stuck with "C35A" for concrete strengh.  So, I read BS 8110

- Structural Use of Concrete, and found C10P, C20P also at of Part 1.

As I see it, C35 means Concrete with cubic strength 35 N/ But

I'm not sure of it and have no idea what the 'A' & 'P' means.

It would be very helpful if you explain me it's meaning and

the references.