Britain's top equity index edged lower on Tuesday, weighed down by weaker mining stocks and a dip in bank HSBC, Reuters reported. The blue-chip FTSE 100 index fell 0.1 percent to 6,780.90 points. The FTSE remains up by more than 3 percent since the start of 2015 but is some 5 percent below a record high of 7,122.74 points set in April. Miners Anglo American and Rio Tinto both fell by more than 2 percent after investment bank Societe Generale cut its ratings on the two companies. HSBC also dipped 0.2 percent after announcing plans to slash jobs, take an axe to its investment bank and shrink its risk-weighted assets by $290 billion in an effort to improve its sluggish performance.