Rule 8.3 - THOMSON CORP

FORM 8.3

    DEALINGS BY PERSONS WITH INTERESTS IN SECURITIES REPRESENTING 1% OR MORE
              (Rule 8.3 of the City Code on Takeovers and Mergers)


1.   KEY INFORMATION

Name of person dealing        BARCLAYS PLC
(Note 1)
Company dealt in              THOMSON CORP
Class of relevant security    COM NPV
to which the dealings being
disclosed relate (Note 2)
Date of dealing               31 January 2008

2.   INTERESTS, SHORT POSITIONS AND RIGHTS TO SUBSCRIBE

(a)  Interests and short positions (following dealing) in the class of relevant
security dealt in (Note 3)

                            Long                     Short

                      Number       (%)         Number       (%)

(1) Relevant       6,068,793     0.95%         888,403    0.14%
securities
(2) Derivatives      290,700     0.05%
(other than
options)
(3) Options and            0     0.00%              0     0.00%
purchase/sell
Total              6,359,493     1.00%        888,403     0.14%

(b)  Interests and short positions in relevant securities of the company, other
     than the class dealt in (Note 3)

Class of                    Long                     Short
relevant
security:

                  Number              (%)   Number              (%)

(1) Relevant
securities

(2) Derivatives
(other than
options)

(3) Options and
agreements to
purchase/sell

Total


  (c)  Rights to subscribe (Note 3)

Class of relevant security:   Details


3.   DEALINGS (Note 4)

  (a)  Purchases and sales

Purchase/sale Number of Securities Price per unit
                                   (GBP)
Purchase      106,000              35.4017 CAD
Purchase      53,400               35.4017 CAD
Purchase      2,653                35.8413 CAD
Purchase      1,900                36.0058 CAD
Purchase      63,900               35.4017 CAD
Purchase      88                   35.8400 CAD
Purchase      344                  35.8413 CAD
Purchase      26,000               35.4017 CAD
Purchase      6                    35.8400 CAD
Purchase      23,400               35.4064 CAD
Purchase      64,800               35.4017 CAD
Purchase      300                  35.0000 CAD
Purchase      2,177                35.8413 CAD
Purchase      1,758                35.2093 CAD
Purchase      59,918               35.4017 CAD
Purchase      15                   35.8400 CAD
Purchase      1,758                35.8400 CAD
Purchase      107                  35.8400 CAD
Purchase      66,700               35.4017 CAD
Sale          23,400               35.4064 CAD
Sale          107                  35.8400 CAD
Sale          1,758                35.8400 CAD
Sale          1,900                36.0058 CAD
Sale          88                   35.8400 CAD

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)


(c)  Options transactions in respect of existing securities

(i)  Writing, selling, purchasing or varying

Product name,   Writing,          Number of          Exercise  Type, e.g.      Expiry   Option money
e.g. call       selling,          securities to      price     American,       date     paid/received
option          purchasing,       which the option             European etc.            per unit (GBP)
                varying etc.      relates (GBP)


(ii) Exercising

Product name, e.g.  Number of           Exercise price per
call option         securities          unit (Note 5)




(d)  Other dealings (including new securities) (Note 4)


Nature of transaction Details           Price per unit
(Note 8)                                (if applicable)
                                        (Note 5)




4.   OTHER INFORMATION
None

Agreements, arrangements or understandings relating to options or derivatives


Full details of any agreement, arrangement or understanding between the
person disclosing and any other person relating to the voting rights of
any relevant securities under any option referred to on this form or
relating to the voting rights or future acquisition or disposal of any
relevant securities to which any derivative referred to on this form is
referenced.  If none, this should be stated.




Is a Supplemental Form 8 attached? (Note 9)                 NO


Date of disclosure                         01 February
Contact name                               Geoff Smith
Telephone number                           020 7116 2913
If a connected EFM, name of
offeree/offeror with which connected
If a connected EFM, state nature of
connection (Note 10)