By Bansari Mayur Kamdar (Reuters) -UK’s benchmark equities index declined on Wednesday, weighed by weakness in consumer staple and healthcare shares, while investors awaited the Federal Reserve’s interest rate decision later in the day. The blue-chip FTSE 100 index closed 0.9% lower, with drugmaker Astrazeneca, GSK and cyclical names such as Diageo, Unilever among the top drags. Rio Tinto plc and Anglo American declined after a ratings cut from Liberum weighed on the mining sector, pulling it down 1.6%. Oil majors Shell and BP rose nearly 0.5% each as crude prices bounced after the European Un…