British firms may need a transition period of up to five years in order to properly prepare for Brexit an alliance of three chambers of commerce warns.

The three chambers - London Chamber of Commerce and Industry (LCCI), Greater Manchester Chamber of Commerce (GMCC) and Business West – who have come together because of specific issues facing the large city regions, said firms are deeply worried about the trade costs of Brexit and felt the proposed 21-month transition period was too limited.

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