Hello there mine range rover p38 dse has very little on the hand brake and as its mot time I need to adjust it can ne one help.

Service manual says....

1. Raise vehicle on four post lift.
2. Ensure brake lever is released. Raise Lift.
3. Raise one rear wheel clear of lift.
4. Tighten brake shoe adjusting bolts to 25Nm. Ensure brake drum is locked.
5. Back off adjusting bolt by 1.5 turns. Check brake drum is free to rotate.

NOTE: Ensure brake shoes are correctly adjusted prior to adjusting cable. Cable adjustment is only to take up stretch in a new cable. It should not be used to adjust for brake shoe wear.

6. Parking brake should be fully operational on third notch of ratchet.
7. To achieve this, release brake lever. From under vehicle, adjust length of outer cable.
8. Lower vehicle.

The shoe adjusting bolt is at the rear of the handbrake drum to the right of where the cable enters.

Good luck.

If it doesn't help you can also check that the oil seal between the brake drum and the t-box isn't perished. It can leak oil into the brake drum, IIRC it usually displays as oil on the bottom of the drum.