Answer: This is covered by Rule 8.3 - Players Deliberate Actions to alter physical conditions.
Penalty Rule 8.3/1: Both Players Are Penalised if Physical Conditions Are Improved with the Other Player's Knowledge.
If a player asks, authorises or allows another player to deliberately alter physical conditions to improve (To alter one or more of the conditions affecting the stroke or other physical conditions affecting play so that a player gains a potential advantage for a stroke.) his or her play:
The player acting on the request will get the general penalty (Loss of hole in match play or two penalty strokes in stroke play) under Rule 8.3, and
·The player who requests, authorises or allows the improvement will also get the general penalty under either Rule 8.1 (Player's Actions That Improve Conditions Affecting the Stroke) or 8.2 (Player's Deliberate Actions to Alter Other Physical Conditions to Affect the Player's Own Ball at Rest or Stroke to Be Made), whichever applies.
Barbara Evennett - Ladies Captain