This Red Nose Day, characters from across CBBC and CBeebies visit Cackle's Academy to try and make Miss Hardbroom laugh. Can Mr Tumble or any of the CBBC stars succeed?

You've seen the sketch, now it is time to go behind the scenes! Radzi meets all the great people involved in putting this together and shows you the secrets of this very special Red Nose Day sketch!

https://www.bbc.co.uk/cbbc/watch/blue...

If you would like to keep up-to-date with all things Blue Peter visit - https://www.bbc.co.uk/cbbc/shows/blue...

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