Neil Cunningham appealed to Prime Minister David Cameron to raise awareness in Dubai, where there has been little publicity about the disappearance in May of Timmy, 27, pictured, of Killin, Stirlingshire.
Mr Cunningham, 42, said: "Not once have the Government or Foreign Office offered the family any expertise to assist."
The Foreign Office expressed "sincere sympathies" and said its staff are in contact with the Dubai authorities.
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