I haven't had time to research this in fine detail, so correct me if I'm wrong, but the way I see it is this. The four protestors were originally prosecuted on criminal damage and GBH charges. The first jury failed to make a decision and a retrial was ordered. They were found guilty as charged - suspicious in itself regarding jury composition - but the 'terrorism connection' wasn't introduced in the Terrorism Act 2000 but the Counter-Terrorism Act of 2008. and had been in the CPS guidelines since then.
The CTA was a reaction to the London bombings of 2005 and hurried through in 2008 because the political class knew the global economy was going on the blink and Israel was seeking rapid expansion, therefore trouble was ahead. The murderous Iraq regime-change that precipitated the terrorism was a major move to support Israel and buttress the rising power of the East. The whole Western politico-cultural edifice is rotten to the core, including the mindset of the judge, and in a state of collapse - the CTA was just the legal icing on their cake.
This is just plain wrong. Judge sneaks in JNOV through the back the door - a 'terrorist connection' - on the criminal damage charge and increases the sentences. We live in an occupied country.