Intro
Mufti Muhammad Sadiq was an inside man for MGA.  In fact, while MGA was laying around all-day getting massages an doing nothing, Mufti Sadiq was doing lots of the work.  See this link, this entry was taken: http://thecult.info/blog/2010/03/27/john-hugh-smyth-pigott/

Mirza Ghulam Ahmad came to know of the claim put forward by J.H. Smyth-Pigott and in response, a disciple of Mirza Ghulam Ahmad, Mufti Muhammad Sadiq, wrote in English for Mirza Ghulam Ahmad a letter to be circulated in England directed towards J.H. Smyth-Pigott. The letter/leaflet was entitled ‘A Warning To A Pretender To Divinity’.

“J.H. Smyth Pigott, Pastor of… London, has recently announced himself as God… on the 7th and 14th of September 1902… God has, therefore, commanded me to warn him… I, therefore, warn him through this notice that if he does not repent of this irreverent claim, he shall be soon annihilated, even in my life-time… God has borne witness to my truth with heavenly signs shown in thousands… The death of Mr. Pigott within my life-time shall be another sign of my truth. If I die before Mr. Pigott, I am not the true Messiah nor am I from God… God shall bring the false Messiah to destruction within the life-time of the true one… 24th November 1902.” (A Warning To A Pretender To Divinity)

Direct Link: http://wiki.qern.org/mirza-ghulam-ahmad/publications/a-warning-to-a-pretender-to-divinity