Steve, do you know any cleaners local to you with busted or knackered old poles you can cut down and recycle ? thats what i usually do.
you could even make one from a £7 decorators pole and a bentley brush, even a wooden broom handle would do at that length
(you may not look as pro or feel as superior as some other forum members though , but at the ned of the day you are just cleaning a window ffs
)