The Beacon cut was from their “You” series (around 1978, I think) which I have listed as being made by Standard Sound (but others tell me it’s Emison). I’m not sure about a similar Trent cut, but Len Groat certainly had a jackdaw approach to buying jingles, encouraging Alfasound to recreate IDs and other music he liked. I always remember that great traffic bed which recreated the theme tune from Cagney & Lacey.