Exhibit 31.1  CERTIFICATIONS  I, Neil
Berkett, certify that:  1.     I have
reviewed this quarterly report on Form 10-Q of Virgin Media Inc. (Virgin
Media) and Virgin Media Investment Holdings Limited.  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 registrants as of, and
for, the periods presented in this report.  4.     The
registrants other certifying officer and I are responsible for establishing
and maintaining the registrants disclosure controls and procedures (as defined
in Exchange Act Rules 13a-15(e) and 15d-15(e)) and Virgin Medias
internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and
15d-15(f)) 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 registrants,
including their consolidated subsidiaries, is made known to us by others within
those entities, particularly during the period in which this report is being
prepared;  b)Designed Virgin Medias internal control over
financial reporting, or caused such internal control over financial reporting
to be designed under our supervision, to provide reasonable assurance regarding
the reliability of financial reporting and the preparation of financial statements
for external purposes in accordance with generally accepted accounting
principles;  c)Evaluated the effectiveness of the
registrants disclosure controls and procedures and presented in this report
our conclusions 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 registrants
internal control over financial reporting that occurred during the registrants
most recent fiscal quarter that has materially affected, or is reasonably
likely to materially affect, the registrants internal control over financial
reporting.  5.     The
registrants other certifying officer and I have disclosed, based on our most
recent evaluation of internal control over financial reporting, to the
registrants auditors and the audit committee of the registrants 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 registrants 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 registrants internal control over financial
reporting.  Date:
  August 7, 2008
  /s/
  Neil BerkettNeil BerkettChief Executive Officer