All - on my 1987 Def 110 I have done the following:
1. Bulkhead, seatbox, gear tunnel front & 2nd row footwell + behind dashboard, all load area: Autoleads sticky sound deadening from Halfords (you car will look like the interior of a seventies russian space ship)
2. On top of it everywhere - NOiseKiller kits for bulkhead, footwell, 2nd row and load area
3. On top of front seats footwell, gear tunnel, load area: U-PM heavy duty sound deadening
4. Engine bay: NOisekiller kit + LR sound deadening on Bonnet + Autoleads on external sides of bulkead + wheel arches
5. Front wheel under arches & engine tray: original LR optional sound deadening (from Def 110 Countyoptions list, all eBay cheap!)
6. Changed tyres to standard Generals & Disco 1:1.222 box.
7: Roof interior: currently only autoleads, but will add egg box from Noisekiller in addition to the standard trim.
I regularly travel between London and Italy - at least 2 - 3 times / year, makes a lot of difference, still not an elextric Lexus in terms of noise but hey I can listen to clasiscal music whilst cruising at 70 - 75 MPH, so all great