I got one of these 1800W pressure washer from argos a little while ago for £39.99 (was £49.99)
140bar max pressure
6M high pressure hose
Adjustable pressure Lance
Integrated washer bottle in handle.
You can also purchase a brush kit for it at half price (£9.49 instead of £19.50ish) when bought at the same time as the washer
3 year "new for old" guarantee available for £7.99 too
I must admit to being a little dubious about it at first but having used it several times now and a few times for almost an hour solid i find it great. The only problem i've had is with the liquid bottle which you can't turn off individually from the washer (at least i didn't manage to)