Local Morrisons garage had a stand of 2m telescopic heavy duty wash brushes - with a hozelock style attachment and on/off control valve on the bottom.
Made by Kingfisher homeware.
Can't find it on their website - but assume national in their petrol stations.
Also had a telescopic 2.5m window cleaning kit - also £8.
Found at Morrisons Doxford Park.
Actually think the window cleaning set - with a soft pad and squigee rubber attachment is probably 3.5m.