the screwfix one includes the patio attachment, but then it's still only £63 @ amazon.
for the 99% that won't use the patio attachment, its £53.99 at amazon too.
or even better with the recent argos offer, £53.99 - instant £5 off (over £50) + £5 gift card = effective £43.99. got mine a couple of weeks ago. SOOOO much easier to clean the car, but it takes ages to set it up (extension cable for the plug, running hosepipe round the side of the house etc), better than just a bucket of water though.