Durham Diocese is at it again. Advertising something for free while making it perfectly obvious that, in reality, they expect you to pay ten quid which, in my opinion, makes the event not free but blooming expensive.
One of the "priorities" of the present bishop of Durham is tackling poverty. The fact that the important people in the diocese think that ten pounds is easily affordable is a strong indication that they have no idea what poverty actually is. Or perhaps they believe that the sort of person who cannot afford to pay ten pounds to listen to a talk on Christmas carols is not really the sort of person they want at one of their events.