you should check out the Vileda mop and broom handles in tesco or b&q most of them have the correct thread are preety cheap and are also extendable 2ft - 4ft we use these as they are also quite sturdy and cheap - about £7ish.
the ones we use have a diamond shaped head on them that you stick scourers to, these can also be useful on first cleans as they can be screwed on to end of wfp and used to remove stubbern marks.
they are worth every penny, hope this helps