"It is striking how optimistic the tone is in financial markets," Andrew Hauser, the BoE's executive director for financial markets, told a Reuters Newsmaker event.

Hauser said it was possible that any disappointing news on COVID-19 vaccines or on the economy in future could prompt an adjustment in market pricing.

"But so far, so good," he added.

(Reporting by William Schomberg and David Milliken, writing by Andy Bruce)