Without in any way wishing to denigrate Buckingham, for which I have the greatest respect (and have spent a fortune collecting all of PD's articles) I'd like to fly the flag for Southwell Central built by John Sutton.
This is a layout that seems to have developed over the years in many ways like Buckingham - articles from MRJ #8 to the last edition of Finescale Railway Modelling Review -and seems to me to be the epitome of the model railway. OK, the scale/track ratio isn't what the finescale fraternity might like, but I think it is an absolute delight. It looks like a real railway, and the standard of modelling is the "uniform standard" that Peter Denny championed. I did actually dabble in 3mm many years ago, but my problem was the lack of ability to build locomotives. I remember John's articles in "Mixed Traffic" which seemed to make it so simple....not for me unfortunately!! I hope the layout and its owner are still going strong!!
Martyn