Shares in electrical retailers were rocked after it emerged the Chancellor's pre-Budget report could add millions to the sector's tax bills.
Dixons, Kingfisher and Carphone Warehouse shares fell as they revealed how changes to controlled foreign company legislation would hit home.
Under the proposals profits from the sale of extended warranties will be brought within the scope of UK taxation.
A loophole currently allows companies to channel profits through off-shore havens, meaning the levels of tax are hugely reduced.
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