Arabian Business - 18 March - The three men, "who have been behind bars since their arrest on February 22, were told this week that their detention in custody would be extended for a further 28 days, until April 12."
Manchester Evening News - 17 May - "charges are yet to be brought against them."
One look at the facebook page of Conrad Clitheroe (or a read of comments posted by their friends) and it is obvious that these guys are serious travelling plane-spotters.
Sending these three guys home immediately would make a great deal of good sense.