'Additional assistance'
Apart from her basic salary for 2012-13, Canadian-born Ms Greene received £200,000 in lieu of a pension, £399,000 under a short-term incentive plan and £127,000 in contractual benefits, including medical insurance and return flights to Canada.
She was also paid £250,000 as an exceptional payment, described in the report as "additional assistance on the purchase of a home". This was offered "given the difference in residential costs between the UK and Canada".
After tax, this amounted to £120,000. This is the sum that Ms Greene is now repaying.
A Department for Business spokeswoman said Mr Cable had been "annoyed" when he learned of the payment and had "asked for and got a full apology from the chairman" of Royal Mail.
Mr Cable said the payment was "unapproved" and he was pleased that it was being returned.
"The company acted quickly to rectify the situation," he added.
"A mistake was made in not seeking my approval - I would not have approved it. The chairman is sorry. The payment is being returned. I now regard the matter closed."
Royal mail would have to sell quite a few stamps to cover that !.