POWER OF ATTORNEY

       Know all by these presents, that the undersigned hereby constitutes and
appoints each of Ben Coulson, Jamie M. Savage, Megan Birtwistle, and Megan E.
Glise signing individually, and with full power of substitution, as the
undersigned's true and lawful attorney-in-fact to:

       (1)     execute for and on behalf of the undersigned, in the
               undersigned's capacity as an officer and/or director of Luxfer
               Holdings PLC (the "Company"), Forms 3, 4, and 5 in accordance
               with Section 16(a) of the Securities Exchange Act of 1934 and the
               rules thereunder (the "Exchange Act"), Form 144 in accordance
               with Rule 144 under the Securities Act of 1933 ("Rule 144") and
               any other forms or reports, including, but not limited to, a Form
               ID, that the undersigned may be required to file in connection
               with the undersigned's ownership, acquisition or disposition of
               securities of the Company;

       (2)     do and perform any and all acts for and on behalf of the
               undersigned which may be necessary or desirable to complete and
               execute any such Form 3, 4 or 5, Form 144 or other form or
               report, complete and execute any amendment or amendments thereto
               and timely file such form or report with the Securities and
               Exchange Commission and any stock exchange or similar authority;
               and

       (3)     take any other action of any type whatsoever in connection with
               the foregoing which, in the opinion of such attorney-in-fact, may
               be of benefit to, in the best interest of, or legally required
               by, the undersigned, it being understood that the documents
               executed by such attorney-in-fact on behalf of the undersigned
               pursuant to this Power of Attorney shall be in such form and
               shall contain such terms and conditions as such attorney-in-fact
               may approve in such attorney-in-fact's discretion.

       The undersigned hereby grants to each such attorney-in-fact full power
and authority to do and perform any and every act and thing whatsoever
requisite, necessary, or proper to be done in the exercise of any of the rights
and powers herein granted, as fully to all intents and purposes as the
undersigned might or could do if personally present, with full power of
substitution or revocation, hereby ratifying and confirming all that such
attorney-in-fact, or such attorney-in-fact's substitute or substitutes, shall
lawfully do or cause to be done by virtue of this power of attorney and the
rights and powers herein granted.  The undersigned acknowledges that the
foregoing attorneys-in-fact, in serving in such capacity at the request of the
undersigned, are not assuming, nor is the Company assuming, any of the
undersigned's responsibilities to comply with Section 16 of the Exchange Act or
Rule 144.

       This Power of Attorney revokes any previous Power of Attorney filed with
the Company for the purposes set forth herein and shall remain in full force and
effect until the undersigned is no longer required to file Forms 3, 4, and 5
with respect to the undersigned's holdings of and transactions in securities
issued by the Company, unless expressly revoked before that time.

       IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to
be executed as of this 30th day of October, 2018.

                                                 /s/ Heather Harding
                                        ----------------------------------------
                                                     Heather Harding

STATE OF WISCONSIN      )
                        ) ss.
COUNTY OF MILWAUKEE     )

       Personally came before me this 30th day of October, 2018, the above-
named, Heather Harding, to me known to be the person who executed the foregoing
instrument and acknowledged the same.

                                        /s/ C. Stanford
                                        -------------------------------------
                                        Notary Public, Milwaukee County, WI
                                        My commission expires August 20, 2021