"Life is like a rollercoaster ride, full of ups and downs..."So says Tom Grey, a man who has been on a down for as long as her cares, or dares, to remember. But as his 50th birthday approaches, he feels a burning need to experience an up again, to feel like he is living, not existing; to make a memory.He needs an adventure, but if he is to achieve all that he wants to, this can't be any old adventure. It has to be the proverbial 'big one', or perhaps, even, the actual Big One.The feel-good factor rides high in this gentle, young-at-heart, British comedy about the misadventures of four friends who are old enough to know better, but who refuse to grow up; unless they can do it without growing old, as they embark on a day trip from Weston-super-Mare to Blackpool in the hope of finding their lost youth at the top of one of Europe's tallest white-knuckle rollercoaster rides.