Having first declared an interest in that I was in the medal trade for over 30 years, I have to say I agree with Nutloose. The guy will be able to get a very nice replica set to wear on appropriate occasions, and meanwhile the originals will raise him a serious amount of dosh - Bosleys are estimating £30k and I wouldn't think that's out of the way.
The last WW2 Bomber Command DFC group I sold before I stopped full time trading was around 4 years ago, and as I remember it went for just over £2,000, which is an indicator of how much rarer these modern gallantry groups are on the market.