Meet Brunel at the Great Exhibition. Sell Queen Victoria a carrier full of modern chocolates. Show Eraosthenes how to measure the size of the Earth. Go drinking with Guy Fawkes. Get blown up at Trafalgar then repaired by 29th century surgeons. Help Cranmer write the prayer book. Lend Bloody Mary a cellphone. Amazingly it works. Help the monks on Lindisfarne with their manuscripts by bringing some coloured biros.