(Reuters) - London's FTSE 100 slid to a two-week low on Tuesday, weighed down by a 5% drop in financial heavyweight HSBC as traders sold stocks globally on the back of a earnings warning from tech giant Apple due to the coronavirus epidemic.The main index shed 0.6%, with HSBC dragging a sub-index of banks 2.5% lower after its annual profit declined and it laid out plans for a major strategic overhaul that included 35,000 job cuts and the halting of share buybacks."We are concerned by the..