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The FTSE 100 gathered momentum by midday, up 1.3% to 7,519.08, as futures markets pointed to a higher open on Wall Street.
This followed Donald Trump's apparently constructive meeting on trade with Chinese counterpart Xi Jinping at the G20 summit over the weekend.
Amid a sea of green, China-related stocks were particularly in favour with JPMorgan Chinese Investment Trust up 7.7%.
LARGE AND MID CAP RISERS AND FALLERS
Publishing firm Future was up 7.7% as it guided for results for the year to 30 September to be ahead of expectations.
Advertising group WPP rose 2.2% after it announced that it had sold its minority shareholding in sports, entertainment and communications group Chime Group Holdings to majority shareholder Providence for £54.4m.
Fresnillo dropped 3.9% on revealing that it expected profits to take an $8m hit, owing to a reassessment of an historical Mexican tax burden.
AstraZeneca advanced 1.2% after the pharmaceutical company said that European regulators had delivered a positive opinion on the cardiovascular outcomes of its type-2 diabetes treatment.
Packaging company DS Smith firmed 1.8% as it completed the sale of two packaging businesses in France and Portugal to International Paper for €63m (£56m).
SMALL CAP RISERS AND FALLERS
Consulting company Science Group shed 0.3% after it made a firm takeover bid for digital radio company Frontier Smart Technologies at 35p per share. Frontier shares jumped 12% to 36.4p amid hopes of a bidding war.
E-sports company Gfinty rallied 1% on announcing that it expected its annual performance to be 'slightly' better than market expectations, as growth in strategic partnerships helped bolster revenues and earnings.
Recruitment firm SThree gained 1.0%, despite announcing that chief operating officer Justin Hughes was standing down from 1 July.
Healthcare group Alliance Pharma dipped 2.5% after it announced that its founder and chief executive John Dawson was standing down.
Engineering group Ricardo fell 1.8% on news that it had agreed to shell out A$9.6m (£5.4m) acquiring Melbourne-based environment, planning and infrastructure advisory consultancy PLC Consulting.