I think BASSAWitch is on the money. The Guardian has published numerous stories that appear to be sourced directly from Unite, as well as comment pieces from supposedly anonymous pilots and managers (where it is always claimed WW is on the cusp of losing support at Waterside).
Through dogged determination The Guardian has been influential in getting News International to admit that phone hacking was far more widespread than it originally claimed. It is a pity that it doesn't deploy the same investigative skills when reporting on BASSA.