Bolstridge Variants - 1881 Census
1881 Index 1881 By County 1881 Variants

The only Variant found in Northumbria is the Bolstridge form
The Midlands region is where the Boulstridge variant is concentrated. Although previously interchangeable with Bolstridge 95% of these families using this variant are still using it in the 1901 census. Follow this link for a detailed popup map of the midlands region. 

Midlands Region Detail

In the London area the name is exclusively Bouldstridge apart from the two children of Thomas Bolstridge. They are living with relatives in Lambeth whilst their father is found at the citadel Plymouth with the rest of his family.