I don't know the code, by when I bought an new TV I contacted Sky Customer Services on 08702-40-40-40 and asked them. It did take about 10mins to get through but they were very helpful and gave me the code, and told me how to program it. Good Luck............
Some people have reported success using the code 065, whilst others have not!
I believe the Techwood Plasma is a rebadged Samsung, however there is no guarantee that the Samsung codes will work for your TV. The list of Samsung codes (Sky and Sky+) are: