The Government is selling Royal Mail short by "pressing ahead" with its current sale, despite selling it at a "huge undervalue", the shadow business secretary said.
Chuka Umunna told Daybreak Royal Mail was valued at "between £2.6-3.3 bn" and endorsed by City brokers.
He warned the sale was becoming "a dream" for City speculators but a nightmare for the taxpayer.
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A cloudy and wet start on Saturday across many central and southern areas of the UK.