B&M – Grantham – Opening Hours & Store Details You’ll find B&M Store situated at a prime spot at 46 High Street, about 0.11 miles south-east from the centre of Grantham (close to Boots). The store is an outstanding addition to the local businesses of Green Hill, Spittlegate, Earlesfield, Harrowby Estate, Londonthorpe, Oasby and Grantham Town Centre. This page will provide you with all the information you need on B&M Grantham, including the working hours, address description, customer reviews and more info.