200p for p g in m?

The expression "200p for p g in m" seems to suggest a pricing or cost scenario where 200 units of currency (likely pounds) are associated with a quantity "p" in relation to "g" (grams) within a larger context of "m" (possibly meters or another measurement). To provide a more accurate interpretation, specific details about what "p," "g," and "m" represent would be needed. If you clarify the context, I can give a more precise answer!