View shows CCK Field key instead of label

When a CCK field is set as an Argument and the 'Title to use when the argument is present' is set to "%1" the resultant Title shows the Allowed Value Key instead of the Allowed Value Label.

I have a number of fields with allowed values using the standard format 'key|label' In most cases the key is a two or three character code and the label is a descriptive text string. I need my View to show the label - not the key.

The argument is only recognised as present if the key is present - it does not recognise the label. This is logical and does not matter when using a link to invoke the View. However, to be user-friendly it might be helpful if the argument recognised either the key or the label.