Seems like their is nothing out of the box and EPiServer suggested making my own method, using GetRoot and FindChild this was very quick to do and my extention method looks a little simething like this :

publicstaticCategory Find(thisCategory category, Guid guid)

{

CategoryCollection categoryCollection = category.Categories;

foreach (Category cat in categoryCollection)

{

if (cat.GUID == guid)

{

return cat;

}

return cat.Find(guid);

}

returnnull;

}