Immigration post Brexit would depend on economy's need - Johnson

By Kylie MacLellan EXETER, England (Reuters) - The level of immigration Britain would accept after a vote to leave the European Union would depend on the needs of the economy, former London mayor and de facto leader of the "Out" campaign Boris Johnson said on Wednesday. Polls show immigration is a key voter concern ahead of a June 23 referendum on Britain's EU membership and those who want to leave the bloc have made taking back control of the borders a central plank of their campaign. Johnson,