London's leading shares dipped on Thursday, with the losers' list dominated by companies that have gone ex-dividend.
Drugmaker AstraZeneca led the downward trend, shedding 3.4%.
Imperial, Royal Dutch Shell and BP also took a turn for the worse after trading without entitlement to their latest dividend pay-out.
Overall, the benchmark FTSE 100 index of top shares was down 28.46 points or 0.39% at 7,273.95.
In the wider FTSE 250, defence group Cobham's shares plunged 15.1% after it issued a new profit warning, its fifth in two years.
On the currency markets, the pound was 0.25% higher against the dollar at $1.2493 and down 0.42% against the euro at 1.1707 euros.