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* FTSE 100 down 0.6%, FTSE 250 falls 0.3%
Nov 27 (Reuters) - London stocks slipped on Friday and
looked set to post their first weekly loss for the month, as
doubts over the efficacy of AstraZeneca's COVID-19 vaccine and
concerns over a post-Brexit trade deal with the European Union
weighed on sentiment.
The blue-chip FTSE 100 index .FTSE fell 0.6%, while the
domestically focussed mid-cap FTSE 250 .FTMC lost 0.3%, with
travel and leisure .FTNMX5750 , aero .FTNMX2710 and energy
.FTNMX0530 stocks among the biggest decliners.
A Bloomberg report said AstraZeneca Plc AZN.L was likely
to run an additional global trial to assess the efficacy of its
COVID-19 vaccine using a lower dosage, amid questions over the
results of its late-stage study. Shares of the drugmaker were
down 0.7%. On the Brexit front, sources told Reuters that EU
assessments of whether to grant market access for UK banks would
not be completed in time for January, as the estranged allies
make a final push for a free trade deal.