No there won't be any 'court decision letters'. @BritManToo, that's not how it works. I also knew of 2 cases whilst I was living in Egypt. DWP simply told the culprits (a husband and wife) that they will have to repay the over payments and have their pensions pegged, just as @Stanton681 said.
They were also told that if they wished to protest, they may do so, but that would result in a prosecution for fraud with the inevitable consequences. Their pension payments were withheld until they agreed to DWP's decision. Needless to say, they agreed.