@neilime
How do you think we can fix this bug?

I tried changing $oLabelHelper->openTag($aLabelAttributes) to $oLabelHelper->openTag() in https://github.com/neilime/zf2-twb-bundle/blob/master/src/TwbBundle/Form/View/Helper/TwbBundleFormRadio.php#L101 and https://github.com/neilime/zf2-twb-bundle/blob/master/src/TwbBundle/Form/View/Helper/TwbBundleFormRadio.php#L97

Please can you try the verly last version on branch master; An update has been made to improve checkbox rendering

I too am having similar issues with radio labels. Within my form i create this element:
$this->add(array(
'name' => 'locationId',
'type' => 'Zend\Form\Element\Radio',
'options' => array(
'label' => 'Location:',
'value_options' => $locationData,
'column-size' => 'sm-10',
'label_attributes' => array(
'class' => 'col-sm-2'
)
),
'attributes' => array(
'required' => true
)
));

...which renders the following html:

< label class="col-sm-2 control-label">Location:</ label>
< div class=" col-sm-10">
< div class="radio">
< label class="col-sm-2 control-label">
< input name="locationId" required="required" value="3" type="radio">Location 1, region, county</ label>
</ div>
</ div>

...where the label for the radio option has been assigned the same class / column width as the elements label.

I ran a composer update this evening (f17bc68).