In reply to Alan M:
The generic abstract is split into context, question, findings (including methods), conclusion, consequences.
In your case e.g.:
Process XYZ has to be regulated because....
Different countries use method ZXY.
In England we use method ABC.
Which method is better/cheaper/safer/...?
I compare published data on the effect of regulation on paramter ZZZ.
I find that method X works best
All countries should adopt approach X, as this will cure AIDS, Cancer and Alzheimer (or not...)
I would aim for about 300 words (1-2 sentences per point)
Same again for the exec. summary, but give it maybe one page.
CB