On 15 August 1867, a Reform Bill was passed, making Middlesbrough a new parliamentary borough, Bolckow was elected member for Middlesbrough the following year.
15 Ağustos 1867' de, Middlesbrough' un yeni bir parlamenter ilçe durumuna getiren bir reform belgesi geçirildi, takip eden yıl Bolckow, Middlebrough' dan vekil seçildi.