Ah ok, i wasn't sure where to find Optifine as it wasn't one of the mods in the mod folder, i've done as you suggested and it appears to have worked, at least my character has two arms and the sheep are no longer on fire. Thanks for the help =)
Title: Graphical Issues with Ubuntu
Version: 3.0.3/3.0.4
OS: Ubuntu 12.04
Java Version: OpenJDK Java 6
Description of Problem:
When Tekkit is run, the tileset graphics appear on the character and entity graphics, the right arm of the character also does not appear in 1st and both 3rd person modes. The Tekkit version is installed from the launcher with no added mods.
Error Messages:
Error Log: