Chas
Very likely as Allan said the star you are thinking of following Orion is Sirius. The constellation it is in is Canis Major (the Big Dog) which is one of the few constellations that looks like what it is supposed to represent, like an upside down dog.
The other possibility is that it is the Planet Jupiter, which will be the brightest object in the night sky (apart from the moon!) at the moment and will be in Gemini to the north east (ie below and to the right) of Orion.
Hope this helps
Malcolm
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