Timber Treatment Use Class 2?

Travis Perkins describe some timber as "Timber Treatment Use Class 2". What does that mean, and will it be suitable for building a garden shed out of? If it is suitable, do I need to treat it further before using it?
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Peter Percival wrote:

Would this link be any help?
http://www.ptgtreatments.co.uk/wp-content/uploads/2012/03/High-Pressure-Treated-Timber-User-Guide.pdf
There is a table explaining treatment 'classes' a short way down the page
If not, try posting your question on uk.d-i-y
Cash
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Cash wrote:

http://www.ptgtreatments.co.uk/wp-content/uploads/2012/03/High-Pressure-Treated-Timber-User-Guide.pdf

Thank you.
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