* To pay 6.6 mln stg in fines and other penalties

* First UK prosecution for overseas corruption

* Ghana launches probe into possible bribery (Adds Ghanaian investigation)

LONDON, Sept 25 (Reuters) - The first firm to be prosecuted in Britain for overseas corruption and breaching United Nations sanctions is to pay 6.6 million pounds ($10.55 million) in fines and penalties, the UK's Serious Fraud Office (SFO) said.

Bridge manufacturer Mabey & Johnson was convicted of two corruption charges relating to contracts in Jamaica and Ghana between 1993 and 2001.

It also pleaded guilty to applying for contracts under the Iraq oil-for-food programme in 2001-02 in breach of U.N. sanctions.

London's Southwark Crown Court was told the company paid out 1 million pounds in sweeteners it thought helped it to win contracts worth 60 million pounds, the Press Association reported.

A subsequent investigation found it had also paid bribes to individuals in Madagascar, Angola, Mozambique and Bangladesh.

The penalties paid by the firm, which is now under new management, include fines of 3.5 million pounds, a confiscation order of 1.1 million pounds, total reparations of just over 1.4 million pounds to Ghana, Iraq and Jamaica, as well as costs.