Why doesn the spreadsheet for the latest month contain up-to-date data?
If the downloaded spreadsheet does not contain up-to-date data, it is possible this is due to an old version of the page being saved in your cache memory. It is often possible to fix this problem by ensuring that you have accessed the page using the link below and by refreshing the web-page before downloading the spreadsheet. http://www.bankofengland.co.uk/statistics/yieldcurve/index.htm.