To follow up Chris' post earlier, the 'HA' case is at:
http://www.bailii.org/scot/cases/ScotCS/2007/CSIH_65.html
To quote from para 17 of the judgement:
"If a decision on credibility is one which depends for its validity on the acceptance of other contradictory facts or inference from such facts, it will be erroneous in point of law if the contradictory position is not supported by any, or sufficient, evidence, or is based on conjecture or speculation (Wani, paragraph 24, quoted with approval in HK at paragraph 30). A bare assertion of incredibility or implausibility may disclose error of law; an immigration judge must give reasons for his decisions on credibility and plausibility (Esen, paragraph 21)"
David
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