The Court of Appeal upheld convictions for membership of a terrorist organisation, holding that an 'organisation' requires only shared aims/purposes and stability of membership, not formal structures or specific terrorist targets. The Court held that 'fostering' means 'encouraging' and can include members encouraging each other within the organisation. The Court established that when sentencing for terrorist organisation membership, the history and nature of the organisation is relevant to objective seriousness - distinguishing between nascent groups and established terrorist organisations with proven records.
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