SHEIKH ZAID BIN SULTANT AL NAHAYYAN, RULER OF ABU DHABI -- THE LARGEST OF THE TRUCIAL STATES -- TODAY (13 JUNE) VISITED REGENT'S PARK MOSQUE IN LONDON. LATER HE WENT TO BUCKINGHAM PALACE WHERE HE HAD LUNCH WITH QUEEN ELIZABETH.

SHEIKH ZAID IS IN LONDON ON AN OFFICIAL FIVE-DAY VISIT. EARLIER THIS WEEK THE RULER OF THE ARABIAN GULF STATE DISCUSSED DEFENCE MATTERS WITH PRIME MINISTER HAROLD WILSON DURING A 35 MINUTE SESSION AT NUMBER 10 DOWNING STREET. DEVELOPMENTS IN THE ARABIAN GULF, LEADING TO THE WITHDRAWAL OF BRITISH TROOPS FROM THE AREA BY THE END OF 1971 ARE ALSO BELIEVED TO HAVE SEEN UNDER DISCUSSION.