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@Scilly.Suffolk
Curious: never seen that before.
The only thing that occurs to me, is that the frame pre-dates the introduction of compact chainsets, so the mount is designed for 52/53 tooth rings. It looks to me as is the FD could come a little lower in the second pic: compare the position of the plate and nut on the front of the braze-on.
You do need a compact specific FD, although to the best of my knowledge it is the depth of the inner cage plate that varies, which won't help here. Campag introduced a single STD/CT FD around 2008: I'd be surprised if Shimano didn't also now just have one.
If you were to try an extension, I think you would need two bolts through the braze-on to keep lateral play in check. However, it does look as if the FD would be too low if you sat the bolt below the mount.
I sit a two pence coin on top of the ring to set the FD height: if you do this, where does this put the mounting bolt? Is filing the slot an option?
I've measured a couple of frames and from the centre of the BB to the bottom of the slot is 140mm: what's yours?