FOR IMMEDIATE RELEASE 29 May 2008

Sirius Exploration Plc

Trading on PLUS Markets

Sirius Exploration Plc (the “Company”) is pleased to announce that its ordinary shares have been admitted to trading on PLUS Markets (under the same trading symbol as on AIM: SXX).

PLUS Markets is an independent London-based equity market, provided by PLUS Markets Group plc, which was recently approved as a Recognised Investment Exchange. PLUS Markets is based on a quote-driven trading system and currently trades full coverage of all London-listed shares including the FTSE 100 and unlisted shares quoted on the AIM and PLUS markets.

Sirius Exploration Plc ordinary shares will continue to be quoted and traded on AIM. Trading through PLUS is intended to enhance investor choice, improve liquidity for shareholders and provide greater access to investors.

ENDS