Sir Terry Wogan and Dermot O'Leary
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Dermot O'Leary joins Sir Terry Wogan for Floral Dance

13 March 2015 Last updated at 11:38 GMT

Sir Terry Wogan has lent his support to Dermot O'Leary's 24-hour Day of Dance, with a rousing rendition of his hit song The Floral Dance.

Comedian John Bishop and the Greensleeves Morris Men dancing troupe joined Dermot outside BBC New Broadcasting House for the performance.

Dermot's charity dancing marathon will end during Friday's Comic Relief programme.