UPDATE 2-FTSE trips on ex-div trade, U.S.-China trade doubts

* FTSE 100 down 0.2%, FTSE 250 up 0.3%
* Stocks trading ex-dividend weigh on main index
* Trade worries persist after Trump signs HK legislation
* Virgin Money UK enjoys best day ever
* Go-Ahead falls after cutting regional bus division targets

(Adds news items, analyst comment, updates to closing prices)
By Shashwat Awasthi
Nov 28 (Reuters) - London's FTSE 100 retreated from a near
four-month high on Thursday, weighed down by stocks trading
ex-dividend and as U.S. ratification of legislation on Hong Kong
raised concerns that progress in trade talks with China may be
undone.
The blue-chip index .FTSE fell 0.2% after four straight
days of gains, with Vodafone VOD.L giving up nearly 4% and
utility National Grid NG.L shedding almost 3% as they traded
without entitlement to a dividend pay-out.
The FTSE 250 .FTMC once again climbed to a near 1-1/2 year
high as it advanced 0.3%. Leading gains almost single-handedly
was Virgin Money UK VMUK.L , which soared 19% on its best day
ever.
The meteoric rise came after provision for claims related to
the PPI mis-selling scandal fell in line with its estimates. CMC
Markets' David Madden said, given the rally in the stock,
traders think a line has been drawn under the scandal.
Some traders and analysts also indicated that the Clydesdale
and Yorkshire Bank owner's decision to suspend the dividend may
have been a shrewd move. Though overall trading volumes were thin, with U.S. markets
shut for Thanksgiving, Asia-focused HSBC HSBA.L and miners
.FTNMX1770 weakened the FTSE 100 after U.S. President Donald
Trump approved legislation backing pro-democracy protesters in
Hong Kong.
The move drew condemnation from Beijing and escalating
tension cast doubts over whether this would derail the attempt
by the two countries to settle their protracted trade dispute.
Other losers on the FTSE 100 included equipment rental firm
Ashtead AHT.L which gave up 2.6% after a downgrade by HSBC.
But online grocer Ocado OCDO.L jumped 3.6% after plans to
open a first "mini" robotic warehouse in Bristol by early 2021
signalled that its warehouse technology can be rolled out more
quickly and in a bigger range of locations. After sterling touching a near seven-month high against the
euro following a YouGov poll that showed Prime Minister Boris
Johnson on course to secure a majority in the Dec. 12 election,
the currency recoiled, helping exporters such as Reckitt RB.L
rise. Transport company Go-Ahead Group GOG.L lagged the mid-caps
as it skidded 3% after mounting costs forced it to lower annual
expectations for its regional bus division.