▁lead ▁to ▁the ▁issue ▁of ▁a ▁new ▁specification ▁number ▁without ▁a ▁new ▁Mark , ▁for ▁instance ▁the ▁Infantry ▁T ank ▁Mark ▁IV ▁Church ill ▁- ▁originally ▁built ▁to ▁specification ▁A 2 2 ▁in ▁ 1 9 4 0 ▁- ▁under w ent ▁a ▁red es ign ▁leading ▁to ▁a ▁better ▁arm oured ▁vehicle ▁the ▁Church ill ▁VII . ▁This ▁improved ▁design ▁was ▁first ▁known ▁as ▁A 2 2 F ▁then ▁ren umber ed ▁as ▁A 4 2 . ▁ ▁Type ▁name ▁and ▁mark ▁Second ly ▁by ▁a ▁descript ive ▁name , ▁as ▁with ▁other ▁equipment ▁in ▁the ▁British ▁Army ▁- ▁e . g . ▁" T ank , ▁Infantry , ▁Mark ▁II ". ▁This ▁reflected ▁the ▁type ▁and ▁model ▁of ▁tank , ▁i . e . ▁" T ank , ▁Infantry , ▁Mark ▁II " ▁is ▁a ▁different ▁tank ▁to ▁" T ank , ▁Infantry , ▁Mark ▁III ". ▁ ▁The ▁scheme ▁was ▁introduced ▁during ▁the ▁First ▁World ▁War ▁but ▁not ▁always ▁applied ▁to ▁earlier ▁designs . ▁The ▁descript ive ▁name ▁could ▁also ▁be ▁modified ▁by ▁the ▁inclusion ▁of ▁" A " ▁den oting ▁an ▁arm ament ▁change ▁or ▁" *" ▁den oting ▁some ▁other ▁change . ▁ ▁Service ▁name ▁Third ly ▁by ▁a ▁name ▁for ▁this ▁model ▁of ▁tank ▁- ▁e . g . ▁Cr us ader . ▁This ▁could ▁have ▁a ▁number ▁associated ▁for ▁the ▁version ▁of ▁this ▁model ▁of ▁tank , ▁e . g . ▁Cr us ader ▁II ▁is ▁the ▁second ▁variant ▁or ▁Mark ▁to ▁the ▁Cr us ader