I was happily bombing along in the L322 when all of a sudden I had a scraping followed by crunching noise and out the back saw one of the belly pans had come off, it looked like below...I'll take a look under her later but is this something you would say I should replace? I'm guessing the reason why it came off is either the connections are rusted through or it wasn't fitted tightly to start with

Looks like the bolts were finger tight after an oil change? I would refit with new bolts and Penny washers. Torque it up to spec, and carry on regardless.

Keep it !
They're useful to help localise the oil stains on the drive  Paul,
2001 Discovery 2 TD5, 211,000 miles & climbing
2006 FFRR TDV8 Vogue 145,000 miles & climbing
Member of Midland (Land) Rover Owners Club, www.mroc.co.uk

For clarity, my piece is actually in a few bits as it broke when it came off....I was just wondering if it is something I should be worried about replacing?

It protect to the engine sump and other bits from road debris flicking up etc
I’d replace it personally  Gone to a good home: 2011 4.4 TDV8 Vogue SE Buckingham Blue with Ivory and clear glass = "Rory"
2025MY Defender D350 90 in Silicon Silver on coils
1974 Series 3 Lightweight = "Millie"
Many, many other Landies over the years
My preferred specialist: www.glenrands.co.uk
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It has various functions that you can decide if you need or not - none critical - lol :

Reduces water / mud being sprayed around the engine / engine bay when you hit big puddles.
Absorbs minor oil leaks (if foam still on the topside)
Reduces spread of leaking oil by collecting it out of the airflow underneath
Minor reduction in engine noise transmission outside the car
Very minor improvement in aerodynamics / airflow under the car

Many owners are happy to live without any of the "benefits" to speed up oil changes / access underneath or just because it was taken off & lost by previous owners / "mechanics". Paul,
2001 Discovery 2 TD5, 211,000 miles & climbing
2006 FFRR TDV8 Vogue 145,000 miles & climbing
Member of Midland (Land) Rover Owners Club, www.mroc.co.uk

Had a look underneath for the first time ( only had her a couple of week)...all looks pretty good under there from a rust perspective.

The mountings for this undertray look OK so it think it must have just been loose !!.....one thing I did notice though was more than a little bit of oil at the back part of the engine area .....not dripping but also not just a small amount.....I'm guessing this could be a sign of the oil cooler leaking. Any way to check short of taking off the bits in-between the Vee ?

I have a 4.4 tdv8 for reference.....I feel the start of some fun🤣

Keep a close eye on the coolant expansion tank for signs of oil.
Mike G reg 2.5VM Vogue Portofino red 1991- 1999
V reg 2.5td P38 Rioja red 1999- 2006
53 reg td6 Vogue Oslo blue 2006- 2015
11 reg 4.4 TdV8 Vogue SE. Baltic blue 2015- date.
https://www.fullfatrr.com/forum/topic56162...tty+affair

Cheers Mike....I'll take a look tomorrow