Many schemes on the Tornado ADV have appeared over the years. On delivery, the RAF paint scheme consisted of Barley grey sides and upper surfaces and light grey undersurfaces with clear demarcation lines. The Barley grey was later changed to camouflage grey BSC 626 with light grey undersurfaces.  In 2005 another scheme was introduced with a medium sea grey over the overall airframe. 

Variations in squadron markings, badges, coloured tails are big.  National markings vary with full colour red-blue RAF roundels and flags, but also toned down ones. Check references but also internet photos. 

Tornado Initial F.mk.2 (F2) : 
upper & sides:   Barley grey / BSC Flint grey BS4800-18-B-21 (Gunze 334 / approx. Humbrol Hu167) 
undersurfaces:  Light grey BSC 627. (Xtracolor X015 / Humbrol Hu166 / Gunze 332). 
Initial scheme with toned down markings. 

Tornado F.mk.3 (F3) 
upper & sides:  "Camouflage" grey BSC 626   (Xtracolor X017) 
undersurfaces:  Light grey BSC 627. (Xtracolor X015 / Humbrol Hu166 / Gunze 332). 
Second scheme with toned down markings. 

Details:

Cockpit interior: mostly light grey (about FS 26280 or BSC 694) ; black switches and knobs. CRT boxes light grey or dark grey. 

Seats: early Martin Baker seats: Medium Sea grey with white airco pipe on headrest, after 1991 Dark Sea grey with black airco pipe. Dark grey head cushion. Olive green seat cushions and yellow survival pack. Brown straps and belts with metal details. 

Gear legs, insides of doors and wheel bays: white with details in metal and black. 

   

I made a decal design. It was printed for personal use for my model including the peculiar white stripes and markings. 

The lower light grey BSC 627 was airbrushed using Humbrol 166 enamel and after that covered with tape a paper to apply the darker side and upper grey of Humbrol 167.
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The red tail required first a matt white base primer coat. In some tail areas on the fin, grey and metal panels are seen. These were masked off with Tamiya tape.
 

After covering the rest of the model, a white base coat was sprayed. The "feathered sword" unit badge was masked off with masking film. I cut out the film after applying it over a printed badge with a very sharp and "dangerous" surgeon scalpel. This makes clear cuts.

This way, I could keep a white base undercoat on the red tail for the badge to applied with a decal.

(NOTE: I later found a way to have these custom decal printed).

After 24 hours drying, the overall surfaces were polished.

The basic model of the Tornado F3 was now ready to receive its first markings through the custom made decals. This was done now to prevent damaging an otherwise outfitted model with all gears and stores that would make handling difficult.

Make sure that the surfaces are gloss to prevent silvering (air bubbles below the decals) later on. The gloss sheen was achieved by spraying on several coats of Johnson Future (called also Klear or Pledge) with an airbrush. 

Some of the home made markings needed are printed on white decal sheet so needed a very carefull cutting to their edges. This is very difficult particularly for the winged sword on the tail.

So the "swords" on the tail were carefully and tediously cut out with a very sharp scalp knife and scissors. 

The special blue numbers 1987-2004 on top of the red vertical tail had to be hand painted. This was done on spare clear decalsheet. I made 6 examples and picked the "best ones" for use on the model. 

(NOTE: I later found a way to have all these custom decal printed).

The particular white Tornado ADV walkway stripes on upper wings, fuselage and intakes were added in white using the home made decals. These needed long cuts. 

(NOTE: I later found a better way to have these custom decal printed).

The white serials from the home made decals were also cut out and added as needed for the particular picked plane desired. 

The cockpit was detailed using the available pictures from references. Detailling was done with stretched sprue and plastic card.

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Now, the airframe and details were touched up in areas regarding some weathering and so on. With very thinned paint and the ProModeller weathering black wash very subtle panels were highlighted. Do not over do it as Tornado's are well maintained.

After 24 hours drying, a protective coat of Johnson Future / Pledge with a bit mixed in Tamiya matting agent was sprayed over the model. this will give an even shine and protect the decals.

The next step is now to add the various detailed airframe parts such as the undercarriage.