Haha, these are great …. they’re spoof’s I think that the company’s slip in for the client 
BBC Essex 1986 David Arnold has in the name check’s set one for ‘Donkey’s Knob’ and I’ve heard jock sings for ‘Betty The Cleaner’ on an Alfasound package and all the hilarious pisstakes by those lovely ‘Bastard Brothers’ (the Alfasound company micky take is particularly on point !)
There was the Lincs FM Alfasound Jam resing where the singer forgot the frequency so it became “One ohhhh, aww, one oh shit point two” “from the Humber to the Wash” … Some are out-takes & gaffes, some I think from the twisted minds of jingle writers 
In the 80’s punky era I’d not be suprised if there were mood or style cuts on stations that reflected this, on Essex Radio you had uber prankster Timbo who loved funny jingles so that might explain the Essex one above.
A great snatch of cuts, thanks !