(Reuters) - Collapsed UK cafe operator Patisserie Holdings said on Friday that it had sold its Baker & Spice business to rival chain Department of Coffee & Social Affairs for 2.5 million pounds, a day after the company sealed deals for its other two main businesses.Struggling with the fallout of accounting irregularities uncovered last year, the company on Thursday sold its Patisserie Valerie chain to Irish private equity fund Causeway Capital and Philpotts brand to food retailer A.F. Blakemore,..