I sort of decided on a Karcher K4 and went to make the purchase yesterday.
It didn't work out because that was the only one they didn't have in stock

However, I was rather taken by a MacAllister product.
https://www.diy.com/departments/mac-all ... icamp=recs
The specs are identical, it comes with a 2-year warranty (Karcher offer 3 years) and it's over £100 less.
I don't know anything about this brand whereas Karcher is reputable.
I would likely use it every couple of weeks to wash the cars and maybe 4 times per year to clean the patio.
Does anyone have any experience or advice to offer?