'In addition the costs associated with the skilled person review are higher than anticipated. This has led to the loss of some customers and revenue in the Model B division. The company has suffered amid 'associated restrictions on Model B clients'. The stockbroking and administration services provider said a 'skilled person' is reviewing the system and controls of its Jarvis Investment Management unit. Jarvis Securities shares fell 15% to 125.80 pence each on Thursday afternoon in London. (Alliance News) - Jarvis Securities PLC on Thursday warned it is trading below market expectations amid a costlier-than-expected probe on one of its divisions.