Last week's surprise announcement that McLaren had signed a deal to resume using Mercedes power units in 2021 sent quite a few shockwaves through the F1 paddock in Sochi last weekend. McLaren used engines from the German manufacturer from 1995 until 2014. But that relationship was strained in 2007 by the explosive revelations subsequently dubbed 'spygate'. The controversy ended up with McLaren being stripped of its championship points for the season and handed a $100 million fine, after the team was found to have received confidential technical information from a high-placed Ferrari employee. At the time, McLaren was effectively operating as Mercedes' works team. The Silver Arrows returned...
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