The FTSE 100 index advanced 0.4%. The commodity-heavy index was up 1.8% for the week and recorded its best week since May this year, with precious and industrial miners the biggest gainers.
The "UK has been quite positive over the last few weeks so supply chain shortages haven't really been holding back the markets," said Thomas Mathews, markets economist at Capital Economics.
The FTSE 100 has risen nearly 12% this year to its highest since February 2020, supported by upbeat earnings, accommodative central bank policies and gains in oil and metal prices, which boosted commodity-related stocks.
However, inflation worries and supply-chain disruptions led the blue-chip index to underperform the wider European stock index, which recovered to pre-pandemic levels at the beginning of this year.
"There is risk that if the labour or product shortages stick around for a bit longer, it could become a more of a permanent drag on earnings and you might see stocks struggle as well," added Mathews.
Banks gained 1.8% on the day and gave the second biggest boost to the index, with HSBC Holdings plc adding 1.9% after Barclays and Bank of America raised their price targets on the stock.
The largest percentage gainer on the FTSE 100 was IAG, up 3.3% after the British Airways owner said its finance chief, Steve Gunning, would step down after the airline's 2021 results report and named Premier Inn hotel operator Whitbread's Nicholas Cadbury as his successor.
The domestically focussed mid-cap index added 0.5%, lifted by travel and leisure stocks.
Mediclinic was the top performer on the mid-cap index after it reported strong first-half revenue growth, which was ahead of pre-pandemic levels.
Graphic: FTSE 100 recovers to pre-pandemic levels
Rio Tinto Group fell 1.4% after the miner reduced its 2021 iron ore shipments forecast.
Global education group Pearson dropped 14.9% to the bottom of the FTSE 100 after saying that COVID-19 and a tight labour market had hit enrolments at U.S. community colleges.
(Reporting by Bansari Mayur Kamdar, Shashank Nayar and Amal S; Editing by Amy Caren Daniel and Jonathan Oatis)
By Shashank Nayar and Bansari Mayur Kamdar