Oh well, bit the bullet and bought 20 metres myself, with Karcher ends. It comes on Thursday and i'll be using it Sunday.
I went to Pirtek, that was a laugh. The original.."yeah, don;t buy it off the internet, we'll beat the price" turned out to..
they could supply 20metres of the cheap crap for 50 for 20 metres, the wired stuff like i just bought was double the price.
The lad who tried to adapt my lance above to fir a Karcher fitting gave me about ten nuts and bolts fitted together (about 10 inches long), i took off either end and it was the same result, only about 8 inches shorter!! It never fit in anycase. The karcher fitting was fine, what i (and he) suspected was a 3/8 BSP fitting never fitted into the thing he had (i reckon its because there was a great big nipple inside it) he reckoned i had a metric l/m or n 8 fitting. So wasted my time at Pirtek, ordered the hose on ebay and ordered a 3/8 to karcher adapter.
Lets see if i'm ready to go on Friday with it all !!