I have £8k to spend and I am looking for a 3.6 TDV8 with less than 100k miles and FSH - ideally from a trade buyer - based in the South East. I know Covid has sent car prices up - but it seems that budget is not enough based upon the listings on Autotrader and eBay - most seem to be £9k+ - but aren't moving. Is my budget unrealistically low?

You certainly shouldn't be too far off the mark, I sold a great example back in 2019 for that kind of money:

https://www.fullfatrr.com/forum/topic53670.html

But then again I also sold a Defender 90 with < 100k on the clock for 10k which would be worth about 15k now! The world has gone mad.  Sold - Bell a 2015 MY16 Loire Blue Autobiography 4.4 SDV8
Previously George a 2007 MY07 Java Black VSE 3.6 TDV8
Previously a 04 MY04 Defender 90

What about this one..??

https://www.fullfatrr.com/forum/topic59805.html Pete
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2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
-Click for Project Fatty off roader-

It's a great car and I would stretch my budget for it - but It is a 15 hour round trip for me which is just too far.

....but half of that would be driving back in something really nice.....

 2011 Range Rover Vogue SE 4.4 TDV8

Previous cars :
2003 Range Rover Vogue TD6
1999 Discovery Td5 ES
1995 BMW M5 3.8 6 speed
1992 Range Rover 3.9 Efi Vogue
1992 BMW M5 3.8
1988 BMW 735i SE
1989 Ford Sierra XR4x4 2.9i
1981 Ford Fiesta Supersport

I can't argue with that...