From SheWhoScrawls: December 9: Moriarty asks Mycroft what to buy Holmes for Christmas
Sherlock
Today I met a fellow claiming to be a friend of yours. He was most interested to know what you would be the most willing to receive as a Christmas present. I did not like the look of the gentleman, as he appeared to find it necessary to lie to me at every opportunity, and so I told him to send you something that was the most likely to be submitted to the rubbish collection with the most haste.
If you must make enemies, my dear brother, could you please try to keep them away from my club as it is very tiresome to be subjected to their nonsense.
Mycroft