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An excellent offering from Ifor. The “effect of the action” is very cleverly done - and I learned a new word.

Jack, can you give me a hint re the titular impact? I can't see the connection between PP and RM

DSC, the Wiki stuff on RM is very helpful....

Agreed, Malone. The wiki entry for RM is the key unless - which is extremely unlikely, I think - you are already au fait. (Google did try to tempt me into being interested in chocolate at first!)

Thank you both, but I am none the wiser.

Look at the left hand column of the central block, read upwards from C and things may become clearer.

And at a certain point read down the right hand column to complete the emerging whatsit.

Thank you, I have moved the relevant cells but am unsure about "displacing another block". I can't reconstruct the top. Sorry to be so dim!

It requires a bit of thought, dsc. You need to displace a 2x2 square in those two columns by moving your block down, so it floats to the top of it. That should help you work out what the letters need to be in the unchecked cells

To be clear, in the final grid the displaced square sits above the moved block, not at the top of the grid