1 would cover this although I cannot comment as I am waiting for the new 2018 edition to land on my doorstep as it only came out about a month ago but I am aware there are a lot of additional regulations and changes to existing so as it stands I could only advise under the 2006 edition + A1 (2009).
Thanks for pointing this out. I didn't know there was an updated version out.
Where did you get yours from?