I am answering my own question, having spoken to an extremely helpful local man who mends dishwashers. We set it to a prewash programme with the water turned off and discconnected and waited for it to reach the humming stage. After 30 seconds of it humming, we reconnected the water hose and turned it on. Hey Presto it started taking water in and is now working fine. Hope this helps if anyone else has same problem.
Juliem, September 2010