Taxes refund when not flown

As my colleague missed his flight this morning, I found myself at a meeting in Edinburgh on my own! I therefore asked to change my flight to the earlier Little Red service. The agent informed me it would be cheaper to buy a new single ticket so I did.
On the drive home, I was thinking - can I claim a refund of the taxes for the unused portion of the flight? I have done this before when I have not used any of the sectors but wasn't sure if I could this time as this was the return leg of my original booking.
Does anyone know if VS will charge an "admin fee" for this too?
All in all, a pretty unproductive day - less than two hours on the ground in Edinburgh but at least that's another two vital tier points!! 8D
On the drive home, I was thinking - can I claim a refund of the taxes for the unused portion of the flight? I have done this before when I have not used any of the sectors but wasn't sure if I could this time as this was the return leg of my original booking.
Does anyone know if VS will charge an "admin fee" for this too?
All in all, a pretty unproductive day - less than two hours on the ground in Edinburgh but at least that's another two vital tier points!! 8D