Thanks Jeff,
reading up on this now. It seems from my reading that I have chromatic abberations which describe the shape and colour issues to a T. Check out this page to see what I mean about the shape and colour problems I am seeing. Maybe the adjustment of collimation has caused this.
http://www.opticalres.com/gentsupp_f.html
Darryl,
Here are some pics down the focuser so you can see how bad things are at the moment, and in the front showing the secondary holder shroud and 2x barlow at the end towards the primary mirror.
Make sense now?
Chris