London Market Report
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The firm, known for its pastries and sausage rolls, said full-year profit would beat market expectations, due to stronger sales and lower commodity prices.
In the 11 weeks to 13 September, the company saw sales rise 4%, thanks in part to shop refurbishments, it said.
Meanwhile the FTSE 100 closed almost flat, down 0.04%, at 6,804.21.
"Not much upside in the FTSE until after the Scottish referendum, so I would stay on the sidelines," said Lex van Dam, a hedge fund manager at Hampstead Capital.
Shares in the brewer SABMiller were the best performer, jumping 9.8%, after the Dutch brewer Heineken rebuffed its offer for a takeover.
The move is being seen as a defensive measure to stop SAB Miller becoming a target itself for AB Inbev, which make Stella Artois.
Elsewhere, Germany's Dax reversed early losses to close almost flat, up 0.09% at 9,659.63, but France's Cac-40 remained lower, down 0.3% at 4,428.63.