The blue-chip FTSE 100 rose 1.3 percent, with energy and financials providing the biggest lift as results eased investor worries about slowing corporate earnings and Brexit.
"This rebound could well be down to some end-of-month position adjusting. However, there have been some indications in the past few days that we might be starting to see a bit of a short-term base, with most of the bad news already priced in to some extent," said Michael Hewson, chief market analyst at CMC Markets UK.
The market was bracing for tech heavyweight Apple Inc's results from the United States on Thursday.
But on the home front, investors drew comfort from Standard Chartered's better than expected profit even as the Asia-focused lender warned that the escalating Sino-U.S. trade war was weighing on business sentiment in its core emerging markets. The shares were up 3.2 percent.
Smurfit Kappa rose 0.5 percent after the Irish packaging group reported consensus-busting earnings and announced an acquisition in Serbia. Peer DS Smith by 1.7 percent.
Oil majors extended Tuesday's rally, with BP up 3.9 percent after the previous day's bumper financial results.
Among the handful of losers on the blue-chip board was retailer Next, down 1.9 percent after the British clothing retailer reported a slowdown in sales growth.
The news underscored concerns about the challenging business conditions on the high street, dragging down Marks & Spencer with it.
Elsewhere, William Hill's bet on Swedish gaming company Mr Green triggered a rally in both stocks and the sector. William Hill rose 1.1 percent but off earlier highs.
Computacenter sank 12.6 percent after the IT services company delivered a tepid forecast for the final quarter. (Reporting by Josephine Mason and Danilo Masoni Editing by David Goodman, Richard Balmforth)
(This story has not been edited by Devdiscourse staff and is auto-generated from a syndicated feed.)