The British capital's benchmark FTSE 100 index of top blue-chip firms won 0.5 per cent from last Friday as traders returned from a four-day holiday weekend, closing at a record high of 7,106.08 points, beating the previous record of 7,103.98 set in April 2015.
The "Santa Rally bullishness appears to remain firm on hopes of an OPEC-led production cut and Trump stimulus," Accendo Markets analyst Mike van Dulken told AFP, with rising oil prices boosting a number of FTSE 100 stocks.
Rising commodity prices have also boosted mining companies on the FTSE.
"The FTSE 100 is the star performer today, helped on its way higher by an excellent turn from the index's mining contingent," said analyst Chris Beauchamp at online trading firm IG.
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Shares in Anglo American shot up 3.6 per cent and BHP Billiton jumped 4.3 per cent and Fresnillo soared 5.2 per cent.
The main corporate deal of the day was British energy giant BP, which announced it has bought a network of Australian petrol stations from supermarket chain Woolworths for USD 1.3 billion (1.2 billion euros).
BP said in a statement that it will establish a strategic partnership with Woolworths in a deal for the purchase, rebranding and operation of Woolworths' existing 527 fuel and convenience stores, plus 16 sites under construction, for the equivalent of AUS dollar 1.8 billion.
The company's share price bumped 1.2 per cent higher to close at 508.90 pence.
Thin trading volumes are expected to continue during what is the last trading week of 2016.
On Wall Street, the tech-heavy Nasdaq pushed higher at the open after having finished at a fresh record yesterday, with the Dow once again briefly flirting with the 20,000 milestone.
US stock prices quickly pulled back, however, with the Dow and Nasdaq down modestly approaching midday.
Meanwhile the dollar, which has strengthened on expectations of rising US interest rates, pushed higher. The euro fell back below the dollar 1.04 level, which it briefly breached last week.
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