I've always taken it to be "standard" for that site!
Barton is 1500 on the MAN QNH, descend deadside turning in same direction as circuit down to 800ft on the QFE by which time you should be passing over the top of the upwind end of the active (at right angles) on your crosswind leg.
But you're right it differs for each place - I thought the default was as for Barton but 2000 feet overhead, 1000 feet circuit on the QFE.
But I only thought that.....