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Only if you restrict yourself to the confines of SR, Geoff. GR affords you several ways to overcome the speed of light barrier. Even SR itself, actually doesn't preclude objects traveling faster than light. It's traveling at the speed of light, which is the problem. There are outcomes to the equations for SR which require that the object obeying those equations must always be traveling faster than light. Those objects (particles) are called tachyons (as you will already know). They're existence is theoretical in nature and we haven't detected any, but it doesn't mean they don't exist. Just that we don't have the means, presently, to detect them.
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