Possible Clues:

• London fish market
• Software mogul ending off drinking mixed gins and swearing
• Old fish market scandal over presentation of accounts?
• Swearing, get a move to Accounts
• Where fish could be found in big sale, originally round East End
• I get slab prepared outside fish market
• Society stops advertising money received from those attending market
• Computer entrepreneur's taken a cut, hiding bad sign in market
• Scandal over submissions of accounts in fish market?
• Old market's advertising poster's over entrance