The pdf files are now accessible.
It well worth reading them as there are some broader discussions with relevance to future cases.
http://www.ukad.org.uk/anti-doping-rule-violations/download-decision/a/6720
http://www.ukad.org.uk/anti-doping-rule-violations/download-decision/b/6720
Firstly Mr Watt refused the sample, as he was out of contract for the next season. Pretty bad/dumb grounds for doing that but in a way understandable.
Then the following timeline: (taking the discussions at face value, the timeline below is basically not disputed by either party. The reason for taking the supplement isn't argued about as it is effectively irrelevant)
Then thinking he was already banned he takes some weight loss supplement (which he knows contains an illegal substance) to work on his beach body for vacation, but stops.
Gets the charging letter about the test refusal (June 13th sent, June 14th received)
Gets a 2nd OOC test, (June 17th) which he takes, and is dinged for steroids. (Notably not the one he thought was in the supplement).
Gets 2nd charging letter.
The fact that he got the notice of charge before the 2nd test, means it was a 2nd offense and hence 8 years. (The argument was advanced that this should be considered a single but aggravated offense of 4 years, which was the main thrust of the appeal).
One legal loophole explored is the date of a doping offense. Is it the point of ingestion or when the sample that results in the AAF is taken. The latter was the point advocated by UKAD, and with some good legal justifications. The tribunal agreed, as did the appeal.
(In simple terms one justification is that some substance only become prohibited by the act of competing. If player Y smokes weed, that in of itself is not a doping offense. However if he races/plays a game before it has cleared his body, then finding the metabolites would be such an offense.)
All in all I have some sympathy for Mr Watt, but am glad he is gone from the sport for 8 years. He was starting out as a personal trainer and coach for the sport. Someone who would use a supplement he knows to contain a banned substance is not someone who should be coaching in a sport, as he could well lead younger players down the wrong path.