Its a DIY one made from a telescopic windsock/flag pole.
The top 3 sections of the pole are too weak to use, so the 10 mtr pole will give you a 24' one,... the 9mtr pole will give you a 20' odd one.
Get the poles from Brian Penfold at
www.skyblueleisure.co.ukHe's getting new 10mtr poles in next week, made to his specification, and stronger than the previous stock.
You run a 6mm ID PVC braided hose (£9.99 for 30mtrs on ebay) through the inside of the pole, and use it the same as Peter Fogwill's pole. Flick it up to the desired height, and hold it in place with your finger on the hose where it exits the base of the pole.
The poles do wear,.. and I'd expect to change it every 6 months or so,.. but at that price you can't complain!