The Securities and Futures Authority, the stockbrokers' regulator, said Kedleston had placed its own interests above those of its customers. The firm no longer has sufficient capital to meet the SFA's financial resources requirements.
The SFA said it was not satisfied that Kedleston 'has sufficient staff with the necessary training and experience to carry on the business'.
None the less, the regulator is allowing Kedleston to execute transactions to close customers' positions, to settle outstanding share trades, and to return assets to its customers.
An SFA spokesman said: 'In some cases, the investment (made by Kedleston) fell outside the scope of the instructions that discretionary clients had given to the stockbroker.' In one instance, the firm committed more money than the client had available.
Only about 10 investors were affected. The SFA is still continuing its investigation and does not know how much the investors may have lost.
Roger Oliffe, Kedleston's sole remaining director, said he hoped to make a statement on Monday. It is believed that Kedleston is owned by Mr Oliffe and other employees.
The SFA spokesman said intervention orders, such as that against Kedleston, did not always result in expulsion from the SFA.Reuse content