The FTSE 100 declined 2.75 percent on Monday, falling 295.98 points to close at 10,484.13 as investors reacted to escalating tensions in the Middle East.

The drop represents approximately £100 billion wiped off the value of Britain's leading stock index, affecting investors with holdings in pensions, ISAs, and other equity-based investments.

Global markets experienced widespread selling as geopolitical concerns over the Middle East conflict prompted risk-averse trading behavior across major financial centers.

The FTSE 100's composition, which includes a significant weighting of defensive sectors such as utilities and consumer staples, helped cushion some of the market volatility compared to other international indices.

The decline reflects broader market uncertainty as investors assess the potential economic implications of the ongoing Middle East situation and its impact on global supply chains and energy markets.