Exhibit

We consent to the incorporation by reference in the registration statements on Form S-8 filed by West Pharmaceutical Services, Inc. on June 1, 2007 (File No. 333-143437) and December 30, 2008 (File No. 333-156492) of our report dated June 22, 2018, with respect to the statements of net assets available for benefits of the West Pharmaceutical Services, Inc. 401(k) Plan as of December 31, 2017 and 2016, the related statements of changes in net assets available for benefits for the years ended December 31, 2017 and 2016, and the related supplemental schedule of assets (held at end of year) as of December 31, 2017, which report appears in the December 31, 2017 annual report on Form 11-K of the West Pharmaceutical Services, Inc. 401(k) Plan.