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                                                                    EXHIBIT 31.1

                    CERTIFICATION OF CHIEF EXECUTIVE OFFICER
                     PURSUANT TO RULE 13A-14(a)[SECTION 302]

I, Mark E. McMillan, certify that:

1.    I have reviewed this Amendment to Annual Report on Form 10-K of Insignia
      Solutions plc;

2.    Based on my knowledge, this report 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
      report;

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

4.    I am responsible for establishing and maintaining disclosure controls and
      procedures (as defined in Exchange Act Rules 13a-15(e) and 15(d)-15(e))
      for the registrant and have:

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

      b)    [Paragraph omitted pursuant to SEC Release 33-8238];

      c)    evaluated the effectiveness of the registrant's disclosure controls
            and procedures and presented in this report my conclusion about
            the effectiveness of the disclosure controls and procedures, as of
            the end of the period covered by this report based on such
            evaluation; and

      d)    disclosed in this report any change in the registrant's internal
            control over financial reporting that occurred during the
            registrant's fourth fiscal quarter of 2004 that has materially
            affected, or is reasonably likely to materially affect, the
            registrant's internal control over financial reporting; and

5.    I have disclosed, based on my most recent evaluation of internal control
      over financial reporting, to the registrant's auditors and the audit
      committee of the registrant's board of directors:

      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 registrant'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 registrant's
            internal control over financial reporting.

Date: May 2, 2005

                                     /s/ Mark E. McMillan
                                     --------------------------------------
                                     Mark E. McMillan
                                     President and Chief Executive Officer,
                                     Principal Financial Officer and
                                     Principal Accounting Officer