Acorn CPM stored on DFS FM disk:
D400-DC00 CCP  loaded from 0:0008+8
DC00-EA00 BDOS loaded from 0:0010+E
EA00-F200 BIOS loaded from 0:0000+8
F200-FFFF MOS  in ROM

Acorn CPM stored on ADFS MFM disk:
If ":0.$.CPM.Z" does not exists, loads directly:
FFFF6700+0600 loaded from 4:0000A+6
FFFF2A00+0300 loaded from 4:00003+3
FFFF2D00+0300 loaded from 4:00007+3
0000D400+1200 loaded from 4:00010+9 CCP + BDOS
0000E600+0E00 loaded from 4:00020+7 BDOS + BIOS

D400-E600 CCP+BDOS
E600-F400 BDOS+BIOS

If ":0.$.CPM.Z" does exist, then:
BBC does *LOAD $.CPM.X         - 6502 code?
B+/Master does *LOAD $.CPM.Y   - 6502 code?
then both do *LOAD $.CPM.Z     - Z80 code?
then tests location &D400 and jumps to &EA00