The Hozelock automatic water timer have a pressure limiting device in 'em to stop possible damage caused by too high a mains pressure. You could try removing that.
It's in the 'exit' connector from the timer.
Also be aware that the Hozelock system uses very simple push fit friction connections in the pipework, it'll only stand so much pressure before the connectors blow!
Edited by Berisford on 01/06/2010 at 16:53
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