If im diving in the UK on a dive i have
Main torch (D8R)
Backup torch (SL6 in pocket)
DSMB and Reel
Spare DSMB
Spare mask
Knife (should be on leg but currently in pocket as strap snapped)
Computer
Watch
Backup tables
1m loop of webbing in drysuit pocket
Storm whistle (attached to BC)
Shoulder mount strobe (Attached to BC)
Occasionally slate
Occasionally camera
Thats on top of the regs,mask,fins,BC,hood,drysuit,gloves etc obviously.
Abroad in warm water where the diving is far easier i tend to manage with 1 torch, always take camera, never slate, never the webbing.