If it was a Defender TD5, it might be £4k+ without even looking at it.
But as it's a Disco TD5 & with your description it might be only scrap value unless you can justify why it should be more.
I sometimes see ebay adverts with no picture and almost no information & wonder if they are surprised to get no response, or just not bothered.
Trying to be helpful - Does it start, run and stop ok?
Was it used and serviced regularly?
Have you checked the chassis, sills and inner wings for rust?
What's the MoT history like - loads of ignored advisories or does everything normally get fixed?
Is it standard or customised or lifted?
Is it nice to behold/perfect, Manual/Auto/Leather, or a bit rubbish?
These things are all relevant, and can make a big difference.