Iris Robinson is facing a police investigation for securing £50,000 from two developers to fund her lover's restaurant business.

The PSNI organised crime branch, which specialises in complex financial probes, has been called in to establish whether any criminal offence had been committed.

Mrs Robinson, 60, was given £25,000 each from two wealthy Northern Ireland property developers, Kenny Campbell and Fred Fraser, to help Kirk McCambley, 21, establish his business.

In the immediate aftermath of the sex and money scandal the mother-of-three and wife of Northern Ireland First Minister Peter Robinson announced she was resigning as MP for Strangford as well as her membership of the Stormont Assembly.

Iris Robinson is currently undergoing acute psychiatric treatment after trying to kill herself last March when she told her husband about her affair.

It has also emerged that Mrs Robinson lobbied for three planning applications on behalf of the two developers.

Peter Robinson, who is already under investigation to establish if he broke his ministerial code of conduct and the pledge of office, has insisted he is confident his name will be cleared.

He has temporarily stood down as First Minister to spend more time with his wife, who it is claimed did not declare her interest in Mr McCambley's business affairs.