From the Wellcome library collection:
When the Wellcome Trust Sanger Centre (now the Sanger Institute) was named after him in 1993, he told the Director, John Sulston: "It had better be good."
What do we make of what Sanger said? Does he mean that now that it bears his name, the institute ought to do good work? (That sounds unusual given that Sanger had an unassuming style and did stellar research all his professional life.)
From New Oxford American English Dictionary:
had better do something: would find it wiser to do something; ought to do something: you had better be careful.)