Labour leader Jeremy Corbyn has called for a motion of no-confidence in the government.
Retail, luxury stocks also lose ground.
The London market was down in midmorning trading Thursday after commodities shares fell.
Retail and luxury stocks largely rose with the markets.
The FTSE 100 in London led the way, climbing 1.7 percent as investors shrugged off their malaise.
The quarter has been marked by concerns over Chinese growth.