LONDON, June 24 (Reuters) - The Bank of England kept the size of its stimulus programme unchanged and left its benchmark interest rate at an all-time low of 0.1% on Thursday. Economists taking part in a Reuters poll had expected no policy changes by the BoE as it waits to see if a post-lockdown jump in inflation proves transitory and whether unemployment rises when the government scales back its job-protection scheme. (Reporting by David Milliken and Andy Bruce; editing by Michael Holden) Our Standards: The Thomson Reuters Trust Principles.