A thrillseeker broke the world record for riding the most roller coasters in one week — reaching an adrenaline-pumping 55. Dean Stokes, 36, had set himself the summer challenge of riding every single rollercoaster in the UK — but his plans were scuppered by Storm Floris. However, he still managed to set a Guinness World Record for the most roller coasters ridden in a single week — after he tackled 55 in just seven days.  He set off from Brighton Palace Pier on Aug. 2 and ended at Thorpe Park on Sunday, Aug. 17.  During that time, he visited 32…