Peston strikes again, with civil tale

So who was the source of Robert Peston's "striking story" on Sir Fred Goodwin's £650k-a-year RBS pension on last night's BBC News at Ten?
Surely not a favoured Peston civil servant - a profession well known for selflessly sparing the taxpayer of any unnecessary pain in this area.
Nor can the tale be described as new - despite Pesto's self promotion - which makes one wonder what the great disseminator's motives are.