LHA increase. 

Coming into force, 30th January -
Will everyone see increases from this date?
http://www.legislation.gov.uk/uksi/2020/27/made

I was presuming April?

Yep, the rates do come into effect from April - the Explanatory Memorandum to the Order says -

This instrument has breached the 21-day rule due to the reduced Parliamentary sitting time as result of the General Election.  The instrument must come into force before the last working day of January which is when rent officers must calculate and publish the new LHA rates that will be effective from April 2020.