By Jess Jones A number of FTSE 100 stocks have defiedthe doom and gloom swirling around London’s dissipating public markets and have returned over 30 per cent this year to hit multi-year highs. London’s FTSE 100 index has been on a record run recently and closed at an all-time high on Friday. Engineer Rolls Royce has performed best over the past six months, rising nearly 100 per cent. The manufacturer was awarded a major contract in October to help provide nuclear-powered attack submarines for Australia. Rolls Royce leads the FTSE 100One of the London Stock Exchange’s major success stories, Ro…