Managed to get some blue data tonight before the cloud arrived with a Hutech LPR filter as well as the H beta. This at least gets rid of Mercury blue line of street lamp pollution. You can see the dark background is less blue polluted.
Here 1.7MB
http://members.optusnet.com.au/~trlee8/LTNB2.jpg
Thanks all I am amazed how good this works. It is almost as good as having dark skies.
Bert