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saw these not sure if there any good but might be worth a punt at under £20
Also electric portable washers for £50
I've got similar to the top one and it works well.
I too have the top one , it's a bit plasticky but is fine for bike and car washing . But I only paid £7.50 in a sale at Go Outdoors not £20 for mine.
Although it's got a brush attachment it, otherwise it's just a bog standard pressure sprayer, like this one which is almost half the price:
http://www.screwfix.com/p/green-pressure-sprayer-7ltr/51100#_=p
It is a good idea though - I put one in the car and use it to get the worst off after a ride, before it dries on. Also doesn't ruin bearings like a proper pressure washer.
Got a hozelock similar to the top.one and it's pretty good
Been using water bottles with "sports" cap or just a tiny hole made by a knife.
Ordered this one just now:
http://www.toollineuk.com/product.php?site=froogle&sn=82469
Wanted 10L so that I can waste some more on tires.
I've always wondered about this linked to a 25l water butt
A mate has one similar to the 12v portable one. I use one similar to the other one. Both do a good job. The 12v one just does it quicker, which after a cold night ride can be a benefit.