**Exhibit 12.1**

----

**CERTIFICATIONS**

I, Thomas Henry Glocer, certifythat:

1. I have reviewed this amendment    to the annual report on Form 20-F of Reuters Group PLC; 

2. Based on my knowledge, this    amendment does not contain any untrue statement of a material fact or omit    to state a material fact necessary to make the statements made, in light    of the circumstances under which such statements were made, not misleading    with respect to the period covered by this amendment; 

3. Based on my knowledge, the    financial statements, and other financial information included in this amendment,    fairly present in all material respects the financial condition, results    of operations and cash flows of the company as of, and for, the periods presented    in this amendment.

4. The Company’s other    certifying officer and I are responsible for establishing and maintaining    disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e)    and 15d-15(e)) for the Company and have:

|   | a)      designed        such disclosure controls and procedures, or caused such disclosure controls        and procedures to be designed under our supervision, to ensure that material        information relating to the Company, including its consolidated subsidiaries,        is made known to us by others within those entities, particularly during        the period in which this amendment is being prepared; |
|--------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   |                                                                                                                                                                                                                                                                                                                                                    |
|--------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|   | b)      evaluated        the effectiveness of the Company’s disclosure controls and procedures        and presented in this amendment our conclusions about the effectiveness        of the disclosure controls and procedures, as of the end of the year        covered by this amendment based on such evaluation; and |

|   |                                                                                                                                                                                                                                                                                                                                                                     |
|--------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|   | c)      disclosed        in this amendment any change in the Company’s internal control        over financial reporting that occurred during the period covered by the        amendment that has materially affected, or is reasonably likely to materially        affect, the Company’s internal control over financial reporting; |

5.      The    Company’s other certifying officer and I have disclosed, based on our    most recent evaluation of internal control over financial reporting, to the    Comapny’s auditors and the audit committee of the Company’s board    of directors (or persons performing the equivalent functions):

|   | a)      all        significant deficiencies and material weaknesses in the design or operation        of internal control over financial reporting which are reasonably likely        to adversely affect the Company’s ability to record, process, summarize        and report financial information; and |
|--------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   |                                                                                                                                                                                                                                |
|--------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|   | b)      any        fraud, whether or not material, that involves management or other employees        who have a significant role in the Company’s internal control over        financial reporting. |

Dated: 21 February 2006

|        |        |                    |
|--------|--------|-------------------------|
|   | By /s/ | Thomas H Glocer         |
|   |   |                         |
|   |   | Thomas H Glocer         |
|   |   | Chief Executive Officer |

----