@Joe90
If you are stuck for a solution to your battery drain problem you could fit a relay in the cable from fuse 49 and switch it from the ignition circuit. Not a total solution but a definite work round that will stop your battery drain easily and cheaply when the ignition is off.
I presume your battery drain shows up on fuse 49.

My battery drain didn't show up anywhere until i pulled the connector on the neg lead module.

@Kiamaria

Nothing on the negative terminal on an '02, but a good shout

@ NDFI

May be worth a try  .
Experience is the only genuine knowledge, but as time passes, I have forgotten more than I can remember
Volvo V70 P2 2006 2.4 Petrol 170bhp Estate SE
MG Midget Mk1 1962

Previous: L322 Range Rover TDV8 3.6 2008; L322 Range Rover TD6 3.0 2002; P38A Range Rover V8 1999

Definitely on Fuse 49, amperage dropped to 0.05 amps when pulled and car asleep.

Navigation System
On Board Computer
On Board Monitor
Audio System

Will have to see if I can isolate further.... .
Experience is the only genuine knowledge, but as time passes, I have forgotten more than I can remember
Volvo V70 P2 2006 2.4 Petrol 170bhp Estate SE
MG Midget Mk1 1962

Previous: L322 Range Rover TDV8 3.6 2008; L322 Range Rover TD6 3.0 2002; P38A Range Rover V8 1999

Does you car have a Connect 2 box about the size of a packet of cigarettes in the wiring harness running below the TV module. It's part of the original car phone system. If so you could try removing it. Undo the two plugs connected to it and plug the plugs together. They are m/f and blue if my memory serves me correctly.
I initially had a current drain similar to yours on fuse 49 circuit, disconnected the Connect 2 and never had a battery drain since, 7 years. When I try and measure for one I consistently get zero.
When I opened the Connect 2 box I found water had got in it and one of the miniature relays in it had corroded in the closed position.
Threw the box away, technology has moved on.
Definitely worth a look, you might be lucky.

A good shout, but I have already removed it sometime ago and plugged the two connectors together

Will it just be a case of removing the connectors from each item as above and seeing what happens? I have looked at the wiring diagrams and they all seem to be "daisy chained" on a red/green wire?

and from the wiring diagrams is the ECU-Navigation (D182) in the black satnav box in the rear cubby? .
Experience is the only genuine knowledge, but as time passes, I have forgotten more than I can remember
Volvo V70 P2 2006 2.4 Petrol 170bhp Estate SE
MG Midget Mk1 1962

Previous: L322 Range Rover TDV8 3.6 2008; L322 Range Rover TD6 3.0 2002; P38A Range Rover V8 1999

More testing:

Unplugged the SatNav unit (original unit), blue and purple plugs and aerial, and locked the car, once asleep amperage down to 0.035amps. So believe I am onto something.

Pretty certain the little red light on the satnav is going out when car is locked but will now check this. .
Experience is the only genuine knowledge, but as time passes, I have forgotten more than I can remember
Volvo V70 P2 2006 2.4 Petrol 170bhp Estate SE
MG Midget Mk1 1962

Previous: L322 Range Rover TDV8 3.6 2008; L322 Range Rover TD6 3.0 2002; P38A Range Rover V8 1999

Try unplugging the aerial to the sat nav only. Leave the Satnav connected.

Decided to dismantle the satnav unit, which was/is working, to see if anything obvious inside.....
This was the underside of the PCB at the bottom front of the unit

I wonder how many Satnav units have been scrapped when all they needed was their teeth cleaned.
Really good result.

Great news Joe, well done!
. Cheers, Greg
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2011 Vogue SE 4.4 with lots of toys in Stornaway

Good find Joe. What is that mess? 2007 Vogue TDV8 in Zermatt Silver with Charcoal

I guess it is just corrosion from some previous water ingress, am guessing that this was causing a short of some kind, or quite simply, as often is the case , the very act of dismantling and putting back together resolved the issue  .
Experience is the only genuine knowledge, but as time passes, I have forgotten more than I can remember
Volvo V70 P2 2006 2.4 Petrol 170bhp Estate SE
MG Midget Mk1 1962

Previous: L322 Range Rover TDV8 3.6 2008; L322 Range Rover TD6 3.0 2002; P38A Range Rover V8 1999

I’ve just had fuse 49 diagnosed for my battery drain issue. Still to confirm what component is the cause. Fuse 49 removed at the moment. Wish I’d seen this thread earlier!