Media may have used the term "discussed" but they were convicted for plotting. By legal definition, in order to commit a crime there has to be a proved conscious intent and actions taken. Even grouping together is considered an action, I assume for 16 years they've dome more than that. There was also existing home made bomb.
Sorry this guy is a criminal and a murderer, his value to society is pretty low to considering he hasn't done anything of a value in his life, except moving to UK.
Here is the article from 2012 on the bomb attack plot: http://www.bbc.co.uk/news/uk-22200133 same guy, already jailed. Plotting an attack is a criminal offence, in most countries classified same as the actual crime.
I would rather stay in UK than anywhere else. Sure there is the inequality but the poor in UK are much "richer" then the poor in other countries used in example. And the rich are much richer then the rich elsewhere.
The main distinction is that if you decide you don't want to be poor here, nothing stands in your way, while as elsewhere you may end up being stuck where you are ( due corruption, casts, discrimination, lack of opportunities etc. ) unless you emigrate.
( I am not UK born, I lived in 4 different countries UK is fourth. The previous ones include one of the top 5 with lowest inequality and I surely don't want to live there )