Though I think they might have been by B&M Produkties, who did the resings of Alfasound’s BBC Radio Northampton package for Roulette 103, replacing the talk over bed with more lyrics, whilst Top Format doesn’t do anything wrong.
The singing sounds really aweful to me. Strange diction, especially the guy sounds like he’s new to this. Pronouncing the words in a strange way. Like ‘I have to do my best on this’ but failing in his attempt. BTW these jingles are sung in Dutch.