They have a brief affair but Cathy ends it as she re-examines her feelings for Paul .
Idris Elba as Lenny ( Season 1 ) , a painter at Cathy 's school .
They have a brief affair but Cathy ends it as Cathy re-examines Cathy 's feelings for Paul .
Idris Elba as Lenny ( Season 1 ) , a painter at Cathy 's school .