Bank of England announces gilt market operation
bankofengland.co.uk
bankofengland.co.uk
The rumor as to why this happened is that a few British pension funds were in jeopardy of needing to put up collateral, which means selling some of their existing bonds, in order to address margin calls. Pension funds selling their bonds would make the problem even worse, and that is why the Bank of England stepped in.
It isn't clear whether this is anything more than a band-aid on a much larger problem: the US continuing its war on inflation is causing the rest of the world's currencies to be devalued because many countries own US treasuries.