Hi I did this about a year ago.
The dash it's self goes in without a problem, fixes back OK. But the vent controls are different between the earlier and TD5 defenders which can causes a little bit of conflict when opening the vents fully. I fitted a Raptor dash so I had to cut the TD5 fascia any way, so I made aluminium plates to replace the plastic inserts of the fascia. you could just remove them or put up with the conflict at fully open.
hope that helps.
Ben