@mags-moran .
Hello Mags
regarding your query on double dipping I am unaware of any changes to the National Cleaning Manual (2006). I had a look at it and the NPSA(2009) Cleaning manual again both mention mop buckets and wringers.
In hps (2009) they talk about changing mop water every 15minutes or when you change location.
There is a new review on HPS Standard IC literature review(2017).It doesn’t mention mopping but does state that it is mandatory for routine environmental cleaning that water should be changed when dirty, every 15 minutes and if changing location.
I didn’t check with the US.I don’t think theres enough here to ban the double dip as all guidance still talks about mop buckets and wringers. I hope this helps Mags.