The idea sounds logical enough. Most people probably spend at least the cost of a car keeping it on the road over the lifetime of the vehicle, so it may make sense for a manufacturer to tap into that after-birth market.
But there is absolutely no reason why those who shop at Kwik-Fit should be any more prone to buy a Ford than they are already. The only possible synergy between Ford as a manufacturer and Kwik-Fit as a service provider would be if Ford chose to force its own exhausts and other components through the Kwik-Fit network.
If that's the case, then the competition authorities might want to take a close look, not withstanding Ford's insistence that there are no such issues to address. Otherwise, these purchases should be seen as more of a diversification for Ford away from manufacturing, rather than a logical extension of it.