I guess the key line from Nick Robinson in that piece was: "The evidence may, however, lead some to suggest that a climate was created in which banks believed they were under pressure from Gordon Brown's government to cut Libor."
The suggestion (from Robinson) being that the Government at the time helped engender a culture where bankers might have felt more inclined to 'manipulate' (fraudulenty or otherwise) interest rates. I think the suggestion being made is that it's unhealthy for politicians to be seen to be influencing how the banks were operating. Not trying to political point score here as I'm sure the Tories would have been in the same boat had they been in power at the time.