Capital allowances treatment of driving instructor cars

The Revenue manual (CA23510) seems fairly clear that driving instructors' cars aren't included within the definition of cars for the purposes of the annual investment allowance. However, a colleague has pointed me towards this www.swat.co.uk/NewsViews/TechnicalNews/tabid/149/articleType/ArticleView/articleId/2986/New-Capital-Allowances-Regime-for-Cars.aspx which clearly states that the new definition of cars in CAA 2001 s268A, to be introduced by Finance Bill 2009 to replace the existing s81, includes driving instructors' cars (and hire cars, and taxis) within the definition of cars. Does this mean driving instructor cars are, from April 2009, no longer eligible for the AIA? The point isn't specifically addressed by s268A itself, although the change to the rule on motorbikes is clear and the wording on cars unsuitable for private use has hardly changed. Does anyone have any thoughts or experience on this?