Exhibit 31.1  CERTIFICATION  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; and  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:  November 10, 2008
  
  /s/  NEIL
  BERKETTNeil BerkettChief Executive Officer