LONDON (Reuters) – Business minister Kwasi Kwarteng has written to the North Sea oil and gas industry asking it to set out a clear plan to reinvest its profits into British energy projects, his department said on Saturday. Energy prices have hit record highs this year and big profits for energy producers have led to repeated calls from the opposition Labour Party for a windfall tax on producers of North Sea oil and gas to fund help for people struggling with energy bills. Earlier this month the government set out plans to scale up domestic sources of affordable, clean and secure energy, includ…