TM Retail will open McColls c-stores at each of the three motorway service stations being opened by a new chain called Extra. The first Extra off the M11 near Cambridge opens at the end of the month. Two more will follow in December and January at Peterborough and Baldock. The development marks the convenience chain's first foray into motorway service retailing. A spokesman said the new stores will stock a strong food to go offer. TM Retail currently operates more than 1,000 stores under the Forbuoys, Martins and McColl's fascias. {{NEWS }}