London stocks were heading for weekly gains, but the FTSE 250 envisioned a loss as travel-related names took a hit amid concerns over another potential strain of the coronavirus that causes COVID-19. The FTSE 100 UKX index, + 0.94%, rose 0.2% and is expected to gain 0.8% for the week, as global stocks struggled to propel themselves up and ahead of a public holiday in the US Monday. The FTSE 250 MCX Index, + 0.09%, more focused on the domestic market, fell 0.1% and faces a weekly loss of 0.4%. Fears over the potential impact on the UK of another strain of coronavirus found in Bristol weighed on travel names such as TUI TUI1, -0.95%, down 4%, Carnival CCL, -0 , 87%, down 3.8%, easyJet EZJ, + 0.37%, down 3.4%, and FirstGroup FGP, + 0.13%, down 0.6%, said Joshua Mahony, senior market analyst at IG. “Recent gains in inventory value have been built on the notion that the vaccination program and reopening process is linear and predictable in nature, but tensions in South Africa and now in Bristol highlight the potential to derail that presumption. “, did he declare. Sky News reported that the mutation in Bristol may be able to bypass vaccines as it changes the appearance of the original strain. This is how a top British scientist warned on Thursday that the much more infectious variant of the coronavirus that causes COVID-19, which first emerged in this country, could “sweep the world”. As for larger shares up, shares of AstraZeneca AZN, + 2.91% AZN, + 3.11% rose 1.6%, the day after the pharmaceutical company, which was in the spotlight for its development of a COVID-19 vaccine with the University of Oxford, announced strong full-year results on Thursday. Shares of pharmaceutical company GlaxoSmithKline GSK, + 1.82% GSK, + 1.22% rose 1%. Mining stocks weighed down, with Anglo American AAL shares -0.02% down more than 1% and Glencore GLEN, -0.26% down 1.5%. Elsewhere, new data has shown that the UK economy sank deeper than any other European country in 2020, as confirmed by the Office for National Statistics. It marked the worst recession since the Great Frost of 1709, but the economy grew 1% in the fourth quarter, avoiding a double-dip recession, analysts noted. Opinion: Why the UK economy can quickly turn a corner.