He used to keep phoning me up, calling himself "David Henderson" trying to engage me in his various schemes and persecutions. I can't claim to have realised that he was a liar and a conman - I thought he was just a nasty and intrusive individual who should be kept in his box. Full credit to the people - primarily the pilot and his mum who were conned out of a lump of money for some flying training, who realised what he was and blew the whistle.
He did at one point try to threaten me with disclosure to my employer of something I'd posted in confidence on the moderators forum, so somehow he had access to that as well. What he didn't know of course, is that my boss had already
me for the particular thing, so I told him to get stuffed ! A very nasty piece of work, but a competent conman sadly.