UPDATE 2-London stocks eke out gains as UK lockdown easing begins

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* Life insurers, banks, miners rise

* Bicycle retailer Halfords soars to 10-month high

* Airline stocks tumble as UK to quarantine air travellers

* FTSE 100 and FTSE 250 up 0.1%
(Adds comments, updates to close)

By Shreyashi Sanyal

May 11 (Reuters) - London's FTSE 100 closed marginally
higher on Monday, on optimism about the United Kingdom's plans
to gradually ease some coronavirus-induced curbs but investors
remained wary of it potentially setting off a second wave of new
infections.

British Prime Minister Boris Johnson said on Sunday the
lockdown will not end yet. He announced a limited easing of
restrictions, allowing people to exercise outside more often and
encouraging some people to return to work.

The FTSE 100 edged 0.1% higher, giving back some
gains after rising as much as 1% during the day. The mid-cap
FTSE 250 added 0.1%.

"When it comes to reopening the economy, there is a fear in
the markets that it might be a case of one step forward and two
steps backwards," said David Madden, market analyst at CMC
Markets in London.

Madden added that the easing of lockdowns has turned out to
be a double-edged sword, as countries such as Germany and South
Korea reported an uptick in new coronavirus infections.

The blue-chip FTSE 100 has now recovered about 20% from a
March low on a raft of global stimulus, but it remains about 27%
down on the year as the outbreak halts supply chains, crushes
consumer spending and puts entire sectors on the verge of
collapse.

British retailers warned the government on Sunday that a
business bailout package of relief, grants and loans will not be
enough to stop the "imminent collapse of many businesses".

UK first-quarter GDP figures due on Wednesday are likely to
underline the economic havoc wreaked by the COVID-19 pandemic,
with economists fearing this year will see the worst slump in
three centuries.

"The experience of countries dealing with the pandemic will
be akin to a trapeze artist in the coming weeks and months as
they attempt the high wire act of rebooting their economies
without risking a significant second wave in the coronavirus
pandemic," said Russ Mould, investment director at AJ Bell.

On a slow company news day, gains were driven by battered
life insurers, banks and miners
.

But airline stocks tumbled again as Johnson said the UK
would soon need to quarantine people coming into the country by
air to prevent a second wave of coronavirus infections. British
Airways-owner IAG fell 3%, while EasyJet Plc,
shed 6%.

British bicycles and car parts retailer Halfords
soared 24% to a ten-month high, boosted by the government's
announcement that people should consider cycling to work when
the lockdown is eased.
(Reporting by Shreyashi Sanyal, Devik Jain and Sagarika
Jaisinghani in Bengaluru; Editing by Anil D'Silva and Giles
Elgood)