263 - 273 Civil Aviation Safety Authority (CASA)(PDF 157KB)
In relation to a particular aircraft’s suitability to operate to a particular runway at an aerodrome, Civil Aviation Order (CAO) 20.7.4 is applicable to aeroplanes, not above 5700 kg, conducting regular public transport operations (single -engine aeroplanes only), private operations, aerial work operations (excluding agricultural operations ) and charter operations. The take-off distance required can be determined for a level, short, dry, grass surface with factors of between 1.15 and 1.25 applied to the distance in the Aircraft Flight Manual for certain maximum take-off weights.
However, where there is an approved foreign flight manual or manufacturer’s data manual (such as a Pilot’s Operating Handbook) that sets out the take-off distance for that aeroplane, that data may be used. CAO 20.7.4 cautions pilots that the data in some manufacturers’ data manuals are unfactored, and should be treated with caution.
Determining whether the take-off distance available is adequate to ensure safe operation of an aircraft is the responsibility of the pilot in command.
Weasel words. 
Try operating this way in the real world. Any (if not all) of the CAsA FOI's I know would be all over this. I know its legal to operate on foreign AFM's but have had the conversation before.
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