Markit Economics released its manufacturing purchasing managers' index (PMI) for the U.K. on Wednesday. The Markit/Chartered Institute of Procurement & Supply manufacturing PMI for the U.K. decreased to 51.4 in June from 51.9 in May, missing expectations for a rise to 52.5. It was the lowest level since April 2013.

May's figure was revised down from 52.0.

A reading above 50 indicates expansion.

The decline was driven by declines in output and new orders.

"The UK manufacturing sector had a disappointing second quarter overall. Growth trends in output and new orders were the weakest since the opening quarter of 2013, as a strong sterling exchange rate and subdued demand from mainland Europe offset the continued solidity of the domestic market," Markit's Senior Economist Rob Dobson said.