By Andy Bruce and Vincent Flasseur LONDON (Reuters) – This week’s plunge in UK financial assets accelerated a longer historic decline signalling a loss of confidence among international investors that Britain may find hard to restore. Markets have been in turmoil since finance minister Kwasi Kwarteng outlined a new economic agenda last Friday. The pound fell to a record low against the U.S. dollar just above $1.03 on Monday and British government bonds have endured some of their worst losses since modern records began. Analysts with major international banks say the market moves indicate a sud…