Caroline Flint, shadow energy and climate change secretary, has launched a stinging attack on the government over its energy-saving policies.
She said: "The government's underhand attempt to mask the real impact of its policies on families' energy bills is shameful.
"At a time when hard-pressed families and pensioners are seeing their incomes squeezed, only this out-of-touch government could expect people to fork out thousands of pounds on new TVs, fridge freezers and washing machines.
"Instead of cooking the books to trick people into thinking their energy bills will be lower, ministers should get behind Labour's plans to overhaul the energy market and deliver fair prices for the public."
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His mother Princess Diana was killed in a car crash in Paris in 1997 when he was just 12 and his brother William was 15.
The 21-year-old, who was arrested on Sunday, also allegedly injured two other people in the attack in the German city of Reutlingen.
She was going to the aid of a family member who got out of the car in the middle of the park and was dragged away by a different tiger.