. ▁The ▁re vised ▁arrangement ▁would ▁have ▁allowed ▁a ▁continu ation ▁of ▁the ▁line ▁beyond ▁Bus he y ▁He ath . ▁ ▁Can cellation ▁The ▁sites ▁of ▁all ▁three ▁new ▁stations ▁were ▁in ▁semi - r ural ▁locations ▁and , ▁as ▁had ▁happened ▁elsewhere , ▁it ▁was ▁intended ▁that ▁the ▁opening ▁of ▁the ▁new ▁section ▁of ▁Under ground ▁line ▁would ▁stim ulate ▁the ▁construction ▁of ▁new ▁resident ial ▁est ates ▁that ▁the ▁stations ▁would ▁then ▁serve . ▁After ▁the ▁war , ▁however , ▁new ▁legisl ation ▁was ▁introduced ▁with ▁the ▁intention ▁of ▁limit ing ▁the ▁continu ing ▁expansion ▁of ▁urban ▁areas ▁into ▁the ▁surrounding ▁coun tr ys ide . ▁This ▁legisl ation ▁created ▁the ▁Metropolitan ▁Green ▁B elt ▁around ▁London ▁and ▁the ▁area ▁designated ▁included ▁the ▁area ▁covered ▁by ▁the ▁new ▁Northern ▁line ▁extension . ▁Without ▁the ▁possibility ▁of ▁construct ing ▁the ▁new ▁housing ▁est ates , ▁the ▁new ▁line ▁had ▁no ▁purpose ▁and ▁the ▁plans ▁for ▁the ▁extension ▁were ▁cancel led ▁in ▁ 1 9 5 0 . ▁▁ ▁During ▁the ▁war , ▁the ▁dep ot ▁buildings ▁were ▁used ▁for ▁the ▁construction ▁of ▁Hal if ax ▁bom bers ▁and ▁the ▁land ▁owned ▁by ▁London ▁Under ground ▁at ▁Bus he y ▁was ▁used ▁for ▁far ming . ▁After ▁the ▁abandon ment ▁of ▁the ▁extension ▁plans , ▁the ▁dep ot ▁buildings ▁became ▁Ald en ham ▁Bus ▁Over ha ul ▁Works . ▁ ▁As ▁a ▁result ▁of ▁the ▁break up ▁of ▁London ▁Transport ▁B uses ▁and ▁the ▁de vol ving ▁of ▁maintenance ▁functions ▁to ▁the