▁Independent ▁Non - Exec utive ▁Director ▁ ▁Tim ▁W ade ▁– ▁Independent ▁Non - Exec utive ▁Director ▁ ▁Lee ▁Camer on ▁– ▁Chief ▁Executive ▁Officer ▁ ▁G av in ▁James ▁– ▁Chief ▁Oper ating ▁Officer ▁ ▁References ▁▁ ▁Category : Def unct ▁companies ▁based ▁in ▁London <0x0A> </s> ▁Pol iste pip ona ▁is ▁an ▁Af rot rop ical ▁genus ▁of ▁pot ter ▁was ps . ▁ ▁References ▁▁ ▁Category : Bi ological ▁p est ▁control ▁was ps ▁Category : P ot ter ▁was ps <0x0A> </s> ▁George ▁Cal vert ▁( F ebru ary ▁ 2 , ▁ 1 7 6 8 ▁– ▁January ▁ 2 8 , ▁ 1 8 3 8 ), ▁was ▁a ▁plant ation ▁owner ▁and ▁slave holder ▁ ▁in ▁late ▁eigh teenth - ▁and ▁early ▁nin ete enth - century ▁Maryland . ▁His ▁plant ation ▁house , ▁R ivers dale ▁plant ation , ▁also ▁known ▁as ▁the ▁Cal vert ▁M ansion , ▁is ▁a ▁five - part , ▁large - scale ▁late ▁Georg ian ▁m ansion ▁with ▁superior ▁Federal ▁interior , ▁built ▁between ▁ 1 8 0 1 ▁and ▁ 1 8 0 7 , ▁and ▁was ▁designated ▁a ▁National ▁Historic ▁Land mark ▁in ▁ 1 9 9 7 . ▁Cal vert ' s ▁wife , ▁the ▁Belg ian - born ▁he ir ess ▁Ros al ie ▁St ier ▁Cal vert , ▁was ▁an ▁in def at ig able ▁correspond ent ▁whose ▁letters , ▁titled ▁M ist ress ▁of ▁R ivers dale , ▁The ▁Plant ation ▁Let ters ▁of