Out of interest could you give us some examples? I've had a look and other than the U23s Premier league I'm not finding anything useful.. I think Coventry do, but then i'd not put them as a similar size club.
Cheers
Yes, Coventry have one. They have been very good at raising funding from local businesses to support theirs. Two of the nearest ones to us are MK Dons and Peterborough. Stevenage did have one but maybe that's changed because of financial problems. A lot of teams in the lower leagues do have an U23's. As already mentioned, Exeter have had fantastic success producing players for the first team and selling some of them on.