▁within ▁V ick ers , ▁V aux hall , ▁Ley land , ▁N uff ield , ▁and ▁later ▁Roll s - Ro y ce . ▁ ▁In ▁ 1 9 4 1 ▁the ▁T ank ▁Board ▁was ▁further ▁re - organ ized ▁to ▁include ▁a ▁Director ▁of ▁Art illery ▁and ▁represent atives ▁from ▁the ▁General ▁Staff . ▁ ▁As ▁ 1 9 4 1 ▁progress ed , ▁with ▁development ▁of ▁greater ▁horse power ▁tank ▁engines , ▁greater ▁str esses ▁were ▁placed ▁on ▁many ▁of ▁the ▁tank ▁components . ▁ ▁Roll s - Ro y ce , ▁a ided ▁by ▁Ley land ▁and ▁V aux hall , ▁started ▁to ▁become ▁more ▁involved ▁in ▁impro ving ▁the ▁design ▁of ▁a ▁greater ▁array ▁of ▁tank ▁components , ▁increasing ▁performance ▁and ▁reli ability . ▁This ▁saw ▁the ▁transition ▁from ▁work ▁on ▁an ▁improved ▁Cr us ader ▁tank , ▁the ▁Caval ier ▁tank , ▁to ▁development ▁of ▁the ▁new ▁C rom well ▁tank . ▁ ▁Roll s - Ro y ce ▁created ▁the ▁Roll s - Ro y ce ▁Meteor , ▁and ▁set ▁its ▁pre - war ▁car ▁design ▁team ▁to ▁work ▁in ▁impro ving ▁tank ▁design ▁to ▁enable ▁its ▁use . ▁ ▁Later ▁in ▁ 1 9 4 1 , ▁the ▁D TD ▁was ▁transferred ▁to ▁the ▁Controller ▁General ▁of ▁Research ▁and ▁Development ▁within ▁the ▁Ministry ▁of ▁Supp ly . ▁ ▁This ▁marked ▁a ▁major ▁change ▁in ▁the ▁focus ▁of ▁the ▁design ▁team . ▁ ▁At ▁this ▁stage ▁the ▁D TD ▁ ▁began ▁to ▁take ▁on ▁a