Interval substitute Ashton struck seven minutes into the second half as the Hammers made it four successive wins over Rovers to lift themselves into the top half of the Premier League.
Mark Hughes´ side had the chances to at least clinch a draw, but after a run of seven successive league and cup victories, Rovers have now taken just five points from their past six games.
Copyright (c) PA Sport 2007, All Rights Reserved.
Do YOU want to write for GiveMeSport? Get started today by signing-up and submitting an article HERE: http://gms.to/writeforgms