Inmarsat Wins the UK's Top Engineering Prize

Pioneering Global Satellite Network and Services Earns Inmarsat Britain's Most Prestigious Award for Engineering Innovation

LONDON, June 8, 2010 - Inmarsat (LSE:ISAT), the leading provider of global mobile satellite
communications services, announced today that it has won the 41st annual
Royal Academy of Engineering MacRobert Award, Britain's biggest prize for
engineering innovation.

The award was made for Inmarsat's groundbreaking Broadband Global Area
Network (BGAN), a mobile satellite communications service. Academy President
Lord Browne of Madingley presented the Inmarsat team with a GBP50,000 prize
and the solid gold MacRobert Award medal at the Academy Awards Dinner at
London's Guildhall held last night (7 June).

The BGAN (Broadband Global Area Network) family of services provides
internet data connectivity anywhere on land, sea and air. It is widely used
for remote, mobile communications for business, government, broadcasters, aid
and relief agencies, and emergency services. On 20 January 2010, just days
after the devastating earthquake in Haiti, Inmarsat's mobile satellite
communications services were being deployed to support emergency relief
efforts in the region by providing essential communications services. After
the initial emergency response, the service allowed the local population to
call family and loved ones.

Dr Geoff Robinson, chairman of the MacRobert Award Judging Panel, said:
"The Inmarsat team had the vision to see the demand for a global broadband
service, and the courage to invest significant time and money in developing
it. They had to overcome formidable engineering challenges to reach their
objective. That their service can deliver such tremendous humanitarian
benefits, in addition to the technical and commercial ones, must be a source
of great satisfaction to this outstanding team."

Andrew Sukawaty, Chairman and CEO Inmarsat, added: "The RAE's MacRobert
award recognises the pinnacle of UK engineering achievement. For us to be a
finalist was a great honour. And for Inmarsat to receive the MacRobert Gold
Medal is the ultimate accolade to a gifted and highly skilled team. Inmarsat
can be rightly proud of its engineering delivery. We congratulate Gene Jilg
and his team for applying the vision and practicality to deliver BGAN to the
world."

Inmarsat's team members sharing the prize included: Chief Technology
Officer, Eugene Jilg; Chief Scientist, Marcus Vilaca, Director, Space Segment
Engineering, Franco Carnevale and Director, System Network Engineering, Alan
Howell, all based at Inmarsat in London.

Notes to editor

1. First presented in 1969, the MacRobert Award honours the
winning company with a gold medal and up to five team members with a tax-free
prize of GBP50,000 between them. www.raeng.org.uk/prizes/macrobert

2. Founded by the MacRobert Trusts, the Award is now presented
by the Academy after a prize fund was established with donations from the
MacRobert Trusts, the Academy and British industry.

3. Founded in 1976, The Royal Academy of Engineering promotes
the engineering and technological welfare of the country. Our fellowship -
comprising the UK's most eminent engineers - provides the leadership and
expertise for our activities, which focus on the relationships between
engineering, technology, and the quality of life. As a national academy, we
provide independent and impartial advice to Government; work to secure the
next generation of engineers; and provide a voice for Britain's engineering
community.

About Inmarsat

Inmarsat plc (LSE: ISAT) is the leading provider of global
mobile satellite communications services. Since 1979, Inmarsat has been
providing reliable voice and high-speed data communications to governments,
enterprises and other organizations, with a range of services that can be
used on land, at sea or in the air. The company's services are delivered
through a global network of more than 400 distribution partners and service
providers operating in 100 countries. For the year ended 31 December 2009,
Inmarsat plc had total revenue of US$1,038.1 million (2008: US$996.7 million)
with an EBITDA of US$594.2 million (2008: US$531.2 million). For more
information, please visit www.inmarsat.com.

Media Contacts: Neville Rawlings On behalf of Inmarsat, Bell Pottinger Public Relations, Tel: +44(0)20-7861-2502, Email: nrawlings at bell-pottinger.co.uk; Jane Sutton, The Royal Academy of Engineering, Tel: +44(0)20-7766-0636, Mob: +44(0)7784-574857, jane.sutton at raeng.org.uk; Chris McLaughlin, Vice President, External Affairs, Inmarsat, Tel No: +44(0)20-7728-1015, Email: chris_mclaughlin at inmarsat.com