Superfast Broadband comes in a number of guises and is commonly referred to as fibre. It is not.
Superfast Broadband is an excellent offering for small offices and the residential market. It is a broadband service delivered by replacing the largest percentage of a circuit with fibre. Essentially, fibre is run from the local Exchange to your nearest cabinet (small green distribution boxes you will see throughout UK streets). From the cabinet, copper completes the delivery of service from the cabinet to your premises. For that reason, a more accurate description more commonly adopted by business suppliers is FTTC (Fibre-To-The-Cabinet).
FTTC is a low-cost service boasting high download speeds making it attractive for small branch offices and the residential market. Irrespective of its headline speeds, it is a contended broadband service with variable performance and low-bandwidth guarantees.
Businesses subscribing to cloud services or whose internet connection is business critical should look at fully-blown end-to-end fibre where business-grade service levels exist.