It wants to speak to Ludovic Black (also known as Victor Black) and David Diaz (also known as David Black and David Stark) as part of its ongoing investigation into Solar Energy Savings Ltd, .
The two brothers, who are former directors of Solar Energy Savings Ltd, failed to attend Blacon and Runcorn police stations in Cheshire on 28 February.
The SFO launched its investigation into Solar Energy Savings Ltd in December 2014 after receiving information from Greater Manchester Police.
It relates to the sale of solar panels to customers of the company and the offer of a “360 Returns Scheme” which promised customers to retun 100% of their purchase monies on maturity. PV Solar Direct Ltd and Ultra Energy Global Ltd were then also used to generate further sales of solar panels.
The nationwide suspected fraud is believed to have created many victims, the majority of whom are older people. Altogether, the victims are estimated to have lost more than £13m.
The suspected offences the SFO wants to talk to the brothers about are believed to have taken place between 1 July 2011 and 18 January 2013.
Both men, it says, were last known to have addresses in the Cheshire and Greater Manchester area. Any members of the public who can help should contact the SFO, in confidence, on 020 7084 4806 or at email@example.com. Alternatively, they can contact Crimestoppers, in complete anonymity, on 0800 555 111 or by using their non-traceable online format crimestoppers-uk.org.