In February 2006, Klass began presenting the "Sunday Breakfast" programme on Classic FM, taking over from Aled Jones (who returned to this slot in 2016). She worked for several years on the station's early morning show on Saturdays and Sundays and currently presents the Saturday and Sunday evening "Smooth Classics" programme (10pm1am). While working on the weekend morning show for Classic FM, she was also heard on London's Capital Radio on Sunday evenings from 8 to 10 pm. This show was also broadcast on GCap Media's One Network local commercial radio stations around the UK.