Ray Tracing reflections - C++

I am implementing a Ray Tracer in C++.

I am having trouble with adding reflections to my scene.

Here is a simple scene with no reflections [ link ].

Here is the same scene with 1 level of reflections on the sphere [ link ].

There are no other objects in the scene.

As an example, this is the sort of thing I expect to achieve: https: //puu.sh/uAbMX/d2c8922c7d.jpg

[take out the space, soz SO only lets me post 2 links]

I'm pretty sure my calculation of reflection direction is sound, as I am getting correct specular highlights.

Any ideas what might be causing this?

My code for adding reflection component to rendered colour:

// Takes incoming vector (towards surface) and surface normal    
void Scene::reflectionTrace( Ray &R, Vex &hitN, int &lvl, Obj *closest, double &t, Col &traceCol ) {
    Vex reflDir = reflectedDir( hitN, R.D );
    Vex reflPos = R.posAt( t );
    reflPos += ((R.D.revV( ) | hitN) < 0.0) ? (hitN * -BIAS) : (hitN * BIAS); 
    // offset ray starting point to avoid self-reflections. | indicates dot product

    Ray reflectRay = Ray( reflDir, reflPos );

    Col reflCol = rayTrace( reflectRay, (lvl - 1) );
    double fresRef = 1.0; //Fresnel( objN, R.D, closest->mat->ior, true );
    traceCol += (closest->kr( ) * (reflCol * fresRef));
}

My reflectedDir function, to calculate the normalised vector ("Vex") for the reflection:

Vex Scene::reflectedDir( Vex &N, Vex &I ) { // R =  I - ((2.0 * (I . N)) * N)
    return ((N * (2.0 * (N | I))) > I).normaliseV( ); // > indicates the left argument taken from the right argument
}

Is the issue with the actual reflection calculation, or perhaps with assigning colours?

Thanks in advance :)