Holding(s) in Company

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARES

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

 iomart Group plc

2 Reason for the notification (please tick the appropriate box or boxes):

An acquisition or disposal of voting rights

Yes

An acquisition or disposal of qualifying financial instruments which may result in the acquisition of shares already issued to which voting rights are attached

An acquisition or disposal of instruments with similar economic effect to qualifying financial instruments

An event changing the breakdown of voting rights

Other (please specify):

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

 Gartmore Investment Limited

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

 See Section 9

5. Date of the transaction and date on which the threshold is crossed or reached:

4 November 2010

6. Date on which issuer notified:

9 November 2010

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

14%

8. Notified details:

A: Voting rights attached to shares

Class/type ofshares

if possible usingthe ISIN CODE

Situation previousto the triggeringtransaction

Resulting situation after the triggering transaction

NumberofShares

NumberofVotingRights

Numberof shares

Number of votingrights

% of voting rights

Direct

Direct

Indirect

Direct

Indirect

 GB0004281639

 15,227,992

15,227,992

 13,357,992

 13,357,992

 13.553%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Expirationdate

Exercise/ConversionPeriod

Number of votingrights that may beacquired if theinstrument isexercised/ converted.

% of votingrights

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Exerciseprice

Expirationdate

Exercise/Conversionperiod

Number of votingrights instrumentrefers to

% of voting rights

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

 13,357,992

 13.553%

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

Fund Managing Co.

Number of shares held

Percentage of issued share capital

UK Registered Owner

Fund

Beneficial owner

Gartmore Fund Managers Limited

4,175,745

4.237%

HSBC GLOBAL CUSTODY NOMINEE UK LTD

56690

GARTMORE FUND MANAGERS LTD A/C GARTMORE UK & IRISH SMALL COMPANIES

4,175,745

4.237%

Gartmore Investment Limited

2,454,247

2.490%

GOLDMAN SACHS NOMINEES LTD

63285

THE GARTMORE UK SMALL CAP BEST IDEAS FUND LIMITED

Gartmore Investment Limited

959,667

0.974%

GARTMORE GROWTH OPPORTUNITIES

56640

GARTMORE GROWTH OPPORTUNITIES PLC

Gartmore Investment Limited

4,808,447

4.879%

NORTRUST NOMINEES LIMITED

54550

STRATHCLYDE PENSION FUND

Gartmore Investment Limited

959,886

0.974%

VIDACOS NOMINEES LTD A/C 2303

THE ALPHAGEN VOLANTIS FUND LIMITED

9,182,247

9.316%

13,357,992

13.553%

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 figures are based on the Company's issued share capital of 98,560,355.

14. Contact name:

 Bruce Hall

15. Contact telephone number:

 0141 931 6400