Holding(s) in Company

Iomart Group PLC
19 April 2007



TR-1(i): NOTIFICATION OF MAJOR INTERESTS IN SHARES


1. Identity of the issuer or the underlying issuer of existing shares to which
voting rights are attached (ii):

Iomart Group plc


2. Reason for the notification (please state Yes/No):


An acquisition or disposal of voting rights: (Yes)


An acquisition or disposal of financial instruments which may result in the
acquisition of shares already issued to which voting rights are attached: (No)


An event changing the breakdown of voting rights: (No)


Other (please specify) : (No)


3. Full name of person(s) subject to the notification obligation (iii):

Gartmore Investment Limited


4. Full name of shareholder(s) (if different from 3.) (iv):

See Section 9


5. Date of the transaction (and date on which the threshold is crossed or
reached if different) (v):

16 April 2007


6. Date on which issuer notified:

17 April 2007


7. Threshold(s) that is/are crossed or reached:

11%


8. Notified details:


A: Voting rights attached to shares

Class/type of shares if possible using    Situation previous to the Triggering
the ISIN CODE                                       transaction (vi)

                                        Number of      Number of voting Rights
                                        shares         (viii)

GB0004281639                              10,639,195                10,639,195




Resulting situation after the triggering transaction (vii)

Class/type of shares if      Number of     Number of voting     % of voting
possible using the ISIN CODE shares        rights (ix)          rights

                             Direct        Direct Indirect (xi) Direct Indirect
                                           (x)

GB0004281639                  11,044,686           11,044,686           11.108%


B: Financial Instruments

Resulting situation after the triggering transaction (xii)

Type of     Expiration Exercise/       Number of voting rights that may  % of
financial   Date       Conversion      be acquired if the instrument is  voting
instrument  (xiii)     Period/ Date    exercised/ converted.             rights
                       (xiv)






Total (A+B)

Number of voting rights                      % of voting rights

      11,044,686                              11.108%


9. Chain of controlled undertakings through which the voting rights and/or the
financial instruments are effectively held, if applicable (xv):

   Fund     Number of   Percentage      UK        Fund      Beneficial owner
 Managing  shares held   of issued  Registered
   Co.                     share       Owner
                          capital
Gartmore
Fund
Managers    1,936,544       1.948%  HSBC GLOBAL  56690   GARTMORE FUND MANAGERS
Limited       ---------    -------- CUSTODY              LTD A/C GARTMORE UK &
                                    NOMINEE UK           IRISH SMALL COMPANIES
                                    LTD

            1,936,544       1.948%
              ---------    --------

Gartmore
Investment
Limited     3,268,540       3.287%  VIDACOS     VOLANT   THE ALPHAGEN VOLANTIS
                                    NOMINEES             FUND LIMITED
                                    LTD A/C
                                    2303
Gartmore
Investment
Limited     3,218,540       3.237%  GOLDMAN      63285   THE GARTMORE UK SMALL
                                    SACHS                CAP BEST IDEAS FUND
                                    NOMINEES             LIMITED
                                    LTD
Gartmore
Investment
Limited       669,617       0.673%  BNY GIL CLT LST      GARTMORE SMALLER
                                    A/C NOMS             COMPANIES TRUST PLC
                                    LTD A/C LST
Gartmore
Investment
Limited        96,933       0.097%  BNY GIL CLT  56640   GARTMORE GROWTH
                                    A/C NOMS             OPPORTUNITIES PLC
                                    LTD A/C
                                    NWSC
Gartmore
Investment
Limited      1,336853       1.344%  NORTRUST     54550   STRATHCLYDE PENSION
                                    NOMINEES             FUND
                                    LIMITED
Gartmore
Investment
Limited       517,659       0.521%  BNY GIL CLT  63076   GARTMORE GO C SHARE
              ---------    -------- A/C NOMS             POOL
                                    LTD A/C
                                    NWSC

            8,702,651       9.160%
              ---------    --------

           10,639,195      11.108%
              =========    ========


Proxy Voting:


10. Name of the proxy holder:

-


11. Number of voting rights proxy holder will cease to hold:

-


12. Date on which proxy holder will cease to hold voting rights:

-


13. Additional information:

All shares are held indirectly


Email contact [e-mail]


14. Contact name:

Alison Averono


15. Contact telephone number:

0207 782 2324



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