UPDATE 1-FTSE 100 gets trade sentiment boost; exporters rise on pound decline

* FTSE 100 up 0.3%, FTSE 250 down 0.2%

* Sterling shaky ahead of ruling on British parliament
suspension

* Blue-chip financial stocks bounce back

* U.S.-China trade sentiment also supports market mood

* Metro Bank falls after ditching bond issue
(Adds news items, analyst comments, updates share prices)

By Shashwat Awasthi and Indranil Sarkar

Sept 24 (Reuters) - London's FTSE 100 moved higher on
Tuesday, bolstered by exporter stocks that rose as sterling
hovered near one-week lows ahead of a key Supreme Court ruling
related to the suspension of Britain's parliament.
The market mood was also lifted by good news that U.S.-China
trade talks would resume next month.

The main index rose 0.3% by 0741 GMT, as financial
stocks rebounded after a sharp sell-off in the
previous session.

However, the more domestically-focussed FTSE 250 index
shed 0.2%, with the pound shaky before a ruling on
whether Prime Minister Boris Johnson acted unlawfully when he
suspended parliament just weeks before Brexit.

"Sterling will likely be sensitive to the ruling, even if it
possibly changes very little," Oanda analyst Craig Erlam said.
"The real battle will likely be around the law that was passed
forcing Johnson to request an extension."

Shares of companies that book a major chunk of their
earnings in dollars advanced, with GlaxoSmithKline,
AstraZeneca and Diageo rising almost 1% each.

Though sentiment was broadly upbeat on hopes that a
resumption in talks would lead to a solution to the protracted
trade war, broader growth worries and a batch of mixed U.S. data
overnight scuppered any hopes of a full-fledged rally.

After its steepest monthly fall this year amid escalating
trade tensions and recession fears in August, the blue-chip
index has rebounded this month as various central banks have cut
interest rates to counteract slowing global growth.

Domestic financial stocks and industrials dragged the
mid-caps lower, though losses were contained thanks to an 8%
jump in A.G.Barr after the soft drinks maker stuck to
its annual forecast despite a "disappointing" first-half.

Among smaller stocks, Metro Bank sank as much as
12% to a fresh life-low, as the troubled lender ditched a
250-million pound bond issue on Monday after failing to attract
investors.

"It shows the kind of mire Metro is in after the accounting
error and now expanding FCA investigation ... this is a worrying
sign that the bank is not able to raise fresh debt and/or
capital when the going gets tough," Markets.com analyst Neil
Wilson said.

AIM-listed ad agency M&C Saatchi slid 14% to its
lowest in more than seven years after warning annual profit
would fall 5%-10% below estimates.
(Reporting by Indranil Sarkar and Shashwat Awasthi in
Bengaluru; Editing by Bernard Orr)