At 0824, the benchmark FTSE 100 index was up 42 points or 0.7% at 5,827.72 with banks and house builders leading the way.
The rise comes after the conclusion of a more civilized US presidential debate that most pundits agreed wouldn't much change the status of the race.
LARGE AND MID-CAP MOVERS
The bank's credit impairment charge was £0.6 billion, up 32% year-on-year, but down 63% versus the prior quarter.
McCarthy & Stone, which builds and operates retirement homes, soared 41% to 117p on news that it had agreed to be acquired by a fund managed by private equity group Lone Star for around £630 million.
McCarthy & Stone investors have been offered 115p cash per share by Lone Star Real Estate Fund VI, representing a 39% premium to the company's closing price on Thursday.
On a slightly more positive note, the fall for the third quarter wasn't as steep as the 75% drop recorded for the second.
London Stock Exchange said it expected its planned acquisition of financial data group Refinitiv to be wrapped up in the first quarter of 2021.
Weakness at Essentra's packaging division was partially offset by an improved performance at its components business.
Hospitality-focused technology firm Vianet (VNET:AIM) gained 5.8% to 67.7p on announcing first-half trading ahead of its Covid-19-revised forecasts.
SEE HERE FOR A LIST OF FTSE WINNERS AND LOSERS