Hi,
A Reflex F&F NOS in the box can go for around £100 - £125.
But I would agree with "DB250F" around £60.00 for a used one. But even with these once common frames are going up in value, as they are becoming rarer. E-bay could see more (but don't forget the fees). Fully built up you may get £200-£250 plus depending what parts were used.
Put it up in the For Sale section on here first to see if any interest.
Better still if you have room for it, keep it.
Aero Reflex were so under rated frames in the 80's.
It's a piece of history and I'm sure your father would like you to keep it.