Industry secret. Nearly all those shout outs are not real.
Every radio station has a demographic and as such fake shout outs are written to appeal to the audience in case they don't get enough good ones.
I used to write them when I work in radio for a station that I shouldn't name but did that kind of thing.
Also, most of the prizes on offer are won in house by staff....
And you thought the tax evasion hoo Haa was bad, now you can't even listen to the radio without feeling you're being ripped off!
The only person I ever had time for when I was in the game was Tony Blackburn. Totally brilliant guy who would set the clock on the radio when he prerecorded his show so that he could do accurate time checks to make his show feel live even if it had been prerecorded. If you ever hear a competition that says 'answers next show' then it's prerecorded. So don't enter. I've probably said too much.
I worked on a local radio station back in the late 80's/early 90's. They rarely had any decent prizes for competitions, so myself and a few other non broadcasting staff were frequently 'competition winners', we're not talking foreign holidays, but minor stuff like 'NOW' compilations and the like.
My favourite story was when the record company failed to label the Prince track 'Sexy MF' properly, it was still a time when 7" singles were played. The 'radio edit' and uncensored version label were on the wrong side of the record. We just trusted the label and made the uncensored version unplayable by scratching the feck out of it. DJ's would frequently put a record on but not listen to it, just check when it was due to finish and quickly visit the toilet etc. So we had Prince shouting out 'You Sexy Mother F*cker' to the whole of West Yorkshire and the boss of the station sprinting down the corridor from his office to the studio screaming 'Jesus Christ !!!!'