Auditors
BDO LLP
55 Baker Street
London W1U 7EU

Reserve Auditors
Ryder Scott Company
1100 Lousiana
Suite 3800
Houston
Texas 77002-5235

Lawyers - English law
Stephenson Harwood
1 Finsbury Circus
London EC2M 7SH

Lawyers - Cololmbian law
Brigard & Urrutia
Calle 70A #4-41
Bogotá

Registrars
Computershare Investor Services Plc
The Pavilions
Bridgwater Road
Bristol BS99 7NH