Lidl are doing these again from the 19th.
They are sturdy telescopic (with positive locks) devices which will support up to 60 kg and extend from 1.6 - 2.9 mtrs. They have pivoted rubber covered pads at either end - one with a left hand and the other a right hand thread so you can 'jack' near anything up tightly by rotating the body. Great for putting up plasterboard on a ceiling on your own. Other thing I've found them useful for is going between two walls on a stairwell and leaning the top of the ladder on to get a better angle for the ladder. And at 9.99 a bit of a steal.