The Great Comic Relief Bake Off - S02E01 - HD-WebDL -- STS

The Great Comic Relief Bake Off - Series 2: Episode 1

Bake Off returns with four special programmes for Comic Relief. Sue Perkins presents as Joanna Lumley, Jennifer Saunders, Lulu, and Dame Edna face Mary and Paul's challenges.
---
TV Rage lists it as The Great Sport Relief Bake Off - S04
Wikipedia says it's The Great Comic Relief Bake Off - S02
Take your pick...and enjoy another STS UL, downloaded straight from the BBC.