Luffenham shares the Goswick problem of having lost three holes during WW2, never got the land back, and in consequence has had to do a certain amount of squeezing around the turn - again see the old plan in the clubhouse for the intriguing holes beyond the current 11th. Sand Moor lost an even greater quantity of land (I think for housing), and has had to do some distinctly unsatisfactory squeezing - a generation ago it was often spoke of in the same breadth as Moortown, but not nowadays.
Sadly not top tier now, but prior to 1939 a Welsh championship venue, Rhyl GC lost large amounts of excellent flat linksland during WW2 and became (as it still is) nine holes only.
Sean will know about the disappearance of the famous old 12th and original 13th at Burnham - two genuine losses, although B&B have worked very hard (and still are) to turn things round.
And, of course, there is Rye (where to quote Patric Dickinson every incarnation has been a contraction). The very sandy seaside holes that once existed beyond the coastguard cottages behind the current 3rd green, extending into Camber, look truly enticing, from the edges of one or two surviving aerial photographs.