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6 April 2006

Service Announcement

Trading and Infolect

AIM Market

Introduction of additional Sectors

Live Date: 24 April 2006

The purpose of this Service Announcement is to advise customers of the addition of 14 new market sectors which are being added to the 6 existing AIM segments as indicated below.

The sectors are being introduced to facilitate the regulation of those AIM securities that have explicitly requested to have their security admitted to a third party trading facility not operated by the London Stock Exchange. The securities will be placed into one of the sectors mentioned based on their current segment / sector combination.

This process is only applicable for AIM Traded securities and not those securities that are officially listed on the London Stock Exchange.

Further information on these changes will be available in a Stock Exchange Notice covering both Primary and Secondary market rule changes for AIM securities.

Market Structure

|SEGMENT CODE |SEGMENT DESCRIPTION |SECTOR CODE |SECTOR DESCRIPTION |

|AIM |AIM (FIRM QUOTED SECURITIES) |AIM3 |AIM FIRM QUOTED 3PTF |

|AIMI |AIM 1 |AMT3 |AIM TRADING 3TPF |

|AIM1 |AIM MARKET SEATS PLUS 1000 NMS |AMP3 |AIM SECS. SEATS+ 1000 NMS 3PTF |

|AIM2 |AIM MARKET SEATS PLUS 2000 NMS |AIS3 |AIM SECS. SEATS+ 2000 NMS 3PTF |

|AIMN |AIM (NON QUOTED SECURITIES) |AMN3 |AIM NON QUOTED 3PTF |

|AMSM |AIM ON SETSMM |AFE3 |AIM FT50 SETSMM 11-5% MAX 3PTF |

| | |AFT3 |AIM FT50 SETSMM 12-5% MAX 3PTF |

| | |A5F3 |AIM FT50 SETSMM 13-10% MAX 3PF |

| | |AFF3 |AIM FT50 SETSMM 14-15% MAX 3PF |

| | |AF53 |AIM FT50 SETSMM 15-10% MAX 3PF |

| | |ASS3 |AIM SECS.SETSMM 16- 5% MAX 3PF |

| | |AMS3 |AIM SEC. SETSMM 17-10% MAX 3PF |

| | |ASE3 |AIM SECS.SETSMM 18-15% MAX-3PF |

| | |ASN3 |AIM SEC.-SETSMM 19 -10% MAX ATS |

Customer Development Service (CDS)

The CDS environment will be live with the new market sectors from Thursday 20 April 2006. Securities will be added to these sectors as part of the normal alignment with the Live trading service.

Administration;

Customer Development Service (CDS)

Customers are advised to take either the Reference Data Changes service for CDS on Wednesday 19 April 2006 - Broadcast Data groups B07, B09, B11, B13 and B75 or to take the Full Reference Data Download B06, B08, B10, B12 and B74 on Thursday 20 April 2006.

This reference data will also be available on Service Channels S04 and S17.

Live Trading Service

Customers are advised to take either the Reference Data Changes service for Live trading on Friday 21 April 2006 - Broadcast Data groups B07, B09, B11, B13 and B75 or to take the Full Reference Data Download B06, B08, B10, B12 and B74 on Monday 24 April 2006.

This reference data will also be available on Service Channels S04 and S17.

Additional Information

If you have any queries or require further information please contact your Account Manager or the Technical Information Desk on 020 7797 3939 (STX 33939).

An archive of previously issued service announcements is available on the Exchange’s website at techlib

If you would like to amend or add further recipients of service announcements, please send the revised email contact details to service.announcements@.

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