Thanks chuckl for making this so clear !!
I edited the hosts file on ubuntu correctly and got the same result when checking
I am thinking my problem was entirely not having edited the hosts file on my local machine before installing ispconfig using putty and also possibly not having blocked out the static IP I gave my ubuntu server from the range used by the DHCP server in my router ... Doh!
again ... thanks for all your wonderful help - what a learning curve this is
I'm off to fix things up.