London Stock Exchange
Between April and August, the FTSE 100 index has lost 10% on global uncertaintiesReuters

The FTSE 100 entrenched its downward slide on 21 August with its worst week of 2015. The resignation announcement from Greek prime minister Alexis Tsipras and his call for new elections late on 20 August, combined with low Chinese manufacturing numbers the following day, ended up taking the biggest bite of the market all week.

"China's manufacturing sector has suffered its biggest drop in more than six years and markets around the world are feeling the effect," said Russ Mould, investment director at AJ Bell. "In the past, if China sneezed Australia caught a cold. But the impact from a slowdown in the world's second largest economy is no longer confined to its neighbours. The devaluation of the yuan will boost exports, although it will take some time before the effects are felt."

The market closed after suffering a -2.83% loss at 6,187.65. Royal Mail was the only FTSE 100 listed company to walk away unscathed, gaining +1.59% in value.

FTSE 100 biggest risers

  • Royal Mail PLC +7.50 (+1.59%) 478.20

FTSE 100 biggest fallers

  • Shire Plc -268.00 (-5.28%) 4,807.00
  • CRH Plc -89.00 (-4.70%) 1,806.00
  • easyJet Plc -78.00 (-4.58%) 1,624.00
  • Carnival Plc -149.00 (-4.44%) 3,209.00
  • Standard Chartered Plc -34.70 (-4.26%) 780.10

FTSE AIM 100 biggest risers

  • Pan African Resources Plc +0.20 (+2.63%) 7.80
  • hVIVO Plc +5.50 (+1.83%) 305.50
  • Smart Metering Systems Plc +6.00 (+1.79%) 341.50
  • RWS Holdings Plc +2.25 (+1.69%) 135.25
  • Velocys Plc +1.13 (+1.64%) 69.88

FTSE AIM 100 biggest fallers

  • Amerisur Resources Plc -3.50 (-12.39%) 24.75
  • Monitise Plc -0.46 (-8.49%) 4.96
  • Epwin Group Plc -11.00 (-7.80%) 130.00
  • Falkland Oil and Gas -1.63 (-7.43%) 20.25
  • Petroceltic International Plc -3.50 (-7.14%) 45.50