What do historians from 2060 think they are doing messing about with the space-time continuum? Did they never watch Dr. Who? They could alter the course of the 2nd World War; create a discrepancy in the historical record - and who knows what will happen? Certainly not Polly, Michael, and Eileen. Not to mention Colin and the Hodbin children who save the day - and all without a sonic screwdriver.