Honestly if you sell it you are not getting much beyond £100-150 I would guess and that's assuming a lot! Maybe less on a bad day.
Trouble is these are also not going to really grow in value like the vintage stuff. There are people with boxes and boxes of this stuff in attics and dealers hands. I would be tempted to put them in a storage box in a loft. When he is in his 40s and if he is nostalgic like the rest of us it will make a nice gift for Christmas or something. If not I'm sure your kids will love it.