Coventry Building Society has finalised its acquisition of The Co-operative Bank, extending its membership to some four-and-a-half million savers.

The deal has been several years in the making and, with the move, the building society now has assets of £89billion.

Services with either institution will be unaffected and savers will sitll get the maximum protection from the Financial Services Compensation Scheme, which entitles you to up to £85,000 in compensation should your provider…