A member of the Cadbury family plans to launch a rival chocolate company in protest at her family’s business being sold to Kraft.

Felicity Loudon, whose great-great-grandfather John Cadbury founded the business in Bournville in 1824, said: “I can’t accept that Cadbury has gone to a plastic cheese company.”

Now the 61-year-old plans to sell her £27million estate in Oxfordshire in order to pursue the family tradition of chocolate-making.

It comes five months after Cadbury shareholders backed the £11.9 billion deal with the American food giant, which produces Dairylea.

“It’s been the worst-handled takeover of all time,” said interior designer Ms Loudon.

“My great-grandfather George would be spinning in his grave.

“I’ve got so many things I want to do and one of them is to make chocolate. I’ve been talking to wonderful chocolate gurus.”

But she will be unable to use the Cadbury name as it is now protected by trademark law for Kraft to use. Ms Loudon admitted she regretted not taking up an invitation from former Business Secretary Lord Mandelson to discuss a strategy to fend off the Kraft bid before the deal was sealed.

She lives in the manor house, which has 100 acres and dates from 1746, with her second husband, John, aged 74.

Ms Loudon said she had told her husband she did not want to “retire and lounge around the indoor pool”.

“I want to make chocolate and I’m jolly well going to do it,” she added.