They'd include some of the programmes broadcast on BBC Radio Four, including panel games such as "Just a minute". They'd include some of the science and medical documentary that Radio 4 would broadcast. They'd also have their own programming - some soap operas, some news, some great documentaries.
All of this meant that English was being used in a variety of ways. There was informal, conversational English. There was English humour and word play. And there was more formal English.
But now the World Service has lost most of that. It is just a rolling news service now. There are some arts and science programmes, but those aren't great. The variety of spoken English is much reduced, and the variety of programming is much less. And everything is repeated every few hours, with some tweaks for different time zones.
Speaking English must be very hard!