(ShareCast News) - Rebecca McDonald is set to retire as non-executive director of Aggreko, the temporary power and temperature control solutions provider said on Tuesday.In a short statement, the FTSE 250 group said McDonald will step down on 1 December, adding she opted to bring a three-year spell with the company to an end because of other commitments."Rebecca has provided invaluable insight and experience during her time as a non-executive director," said group chairman Ken Hanna.Aggreko shares were up 0.20% to 1,007.00p at 0813 GMT on Tuesday.