1978 commercial for the Mackintosh Prize Bar

Rowntree’s was a confectionery business based in York, England. It is now a historic brand currently owned by Nestlé that is used to market a range of fruit gums and pastilles formerly owned by that business. Following a merger with John Mackintosh & Co., the Company became known as Rowntree Mackintosh, was listed on the London Stock Exchange and was once a constituent of the FTSE 100 Index. It was acquired by Nestlé in 1988.

Info gleaned from Wikipedia