Thanks for the advice but i have tried everything other than an optimiser disc like you used. I am hugely disappointed with the picture on all formats. Cinema, normal and professional are far too dim ( and i watch in subdued lighting in a room that does not get much natural light) so God knows what the picture would be like in a bright room. Whites are a bit washed out on these modes too imo.THX mode is bright enough but as i said it covers everything with a yellowish brown veil and makes whites creamy. Game mode improved things a little for blue ray but on dvd it is too harsh and bright.
Upscaled DVD pictures are not very good either compared to my last panny plasma, the TH-37PX80B, and are grainy and harsh looking.
My mate was round tonight, he has a panny TX-P46G20 and he can't believe it is the same make and supposed to be an updated improved model. He was as disappointed as me.His tv is night and day compared to this one. I know it was well reviewed by what hi fi but to be honest my trust in their reviews has dropped considerably after this purchase as the picture is so disappointing. I cannot for the life of me understand how it got 5 stars.
I have decided to return it to richer sounds. They will charge me 60 quid for doing so but i think it is a price worth paying as i will never be happy with this tv. Going to get the Panny TXL-42E30B which i have seen and been v impressed with. Should have bought that one but I stuck with plasma as its what i had previously. Thanks for all the help anyway.