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Hi Simon,
You can use an EOS clip CLS filter or a front mounted Hutech IDAS LPS filter on the DSLR and try and eliminate some of the nasty stuff, but what may help more is a longer focal length refractor (in the F7 or higher range). Wide field F5 refractors will take faster pictures with more coming through but you will also get the light pollution along with it. Just like a higher mag eyepiece reduces the Field of view and then increases the contrast, a longer FL scope will reduce "somewhat" the effects of Light pollution.
So, filters on a fast F5-6 or slower refractor may help, otherwise, you would be looking at imaging in narrowband using a dedicated mono cooled CCD camera and say OIII, SII and Ha filters which completely nix the sludge. This is obviously much more expensive, but may be the only option later on if the DSLR and the LP filters don't remove enough of the nasty stuff for your taste.
My EOS clip does an OK job, so its a relatively easy way to try it out and see what you think. A quality refractor will set you back a bit, but the views will be amazing, visually and photographically and most mounts will carry these with ease.
Good luck with it.
Cheers
Chris
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