Kärcher K2 Compact Pressure Washer from John Lewis.
110 bar pressure, ideal for light jobs such as cleaning the car, patio, decking etc. Please note that this does not come with the additional t50 patio cleaning accessory but the standard spray gun in this package will do the job adequately. If you require the accessory you can get the 'compact home' edition for £65 from amazon or Homebase.
I've been after something like this for a while and £48 is a steal. At the time of posting click and collect wasn't available. Standard delivery from John Lewis is £3.50 but is free for £50+ so not difficult to find add on items to round it up to £50. (I recommend a couple of Egyptian cotton flannels in the sale at £1 each!)
2 year manufacturers guarantee included.
Only slight drawback is that you need to allow 14 days for delivery. Lets be honest, this is a Summer thing so I wouldn't have thought that matters too much.