Capital gains relief on loans prior to April 2015?

There was some confusion on this forum about the position of (capital gains) tax relief on loans which entered some sort of formal (administration like) process before April 2015, but at that point weren't worthless. People seemed concerned that a capital loss couldn't be claimed at that point because the loan wasn't 'essentially worthless', but a loss couldn't be claimed after the new legislation came into effect because the administration process started too early.

Does anyone have a better understanding now? (I am interested because of my holding in AC loan 146 'The Plumber' so I am tagging andrewholgate , but I imagine there will be FC and TC and other platforms with loans in a similar position.)