I think the term used internally was "the six pack".
Mod 02196 introduced a taller headbox and a new head pad with improved impact attenuation properties. Mod 02196 also saw the introduction of steering lines to the GQ1000 Mk1 parachute which resulted in the GQ1000 Mk2.
Mod 02200 saw the introduction of a simplified restraint harness with a parachute steering facility, to permit integration of the GQ1000 Mk2 steering lines (Mod 02196) and allow the aircrew to strap in unassisted.
Mod 02197 involved the replacement of the primary and secondary ejection gun cartridges.
It would seem, according to the BOI report into the loss of Tornado ZA554, that mod 02198 was split into mods 02198A and 02198B. Mod 02198A introduced a new drogue withdrawal line and protective top flap. Mod 02198B introduced a new parachute (GQ5000),
a gas operated shackle and associated pipework, and a gas fired BTTDFU and associated timing mechanism. It should be pointed out that the gas shackle and modified BTTDFU, which became known as the GFTDU, where not part of the original MoD 02198 but became necessary after the scissor shackle failure in Oct 1998.
DV