You could either have a jet to Heathrow, take 4 or more buses or simply drive to Heathrow. There are lots of signs so you wont get lost
233.07 kilometres (144.83 miles)
114 kilometres (70.84 miles)
517.75 kilometres (321.71 miles)
According to multimap.com 55.85 miles on the fastest route by roads (M11, M25, M1)