I discovered it back in the 80s on Sunday late night public TV. I’ve got the DVDs and maybe one of the novels. They also ran some others like Bulman, Target, Star Cops, and Bergerac.
To me, Sandbaggers is a very well done series given the probably very low budget it had.
Ray Lonnen (Willie) is on Twitter fwiw.
Never really watched Bulman, never watched any Star Cops, watched Bergerac every week (in fact there is talk of a new version with a younger lead actor), Target was in fact taken off air by the BBC in 1978 as it was too violent.