Front space in the Fiesta ST is excellent, so all shapes and sizes of driver should be happy with the head and leg room on offer. Ford also includes a decent glovebox, a sizeable cubby at the base of the dashboard and generous door pockets in which to store odds and sods.
In the back, a couple of adults will find it more of a squeeze behind two in the front, while three side by side will be downright uncomfortable. However, the space on offer is an improvement over the previous Fiesta ST, and it's not like the Peugeot 208 GTi and Renault Clio RS offer more rear space. Three and five-door Fiesta STs will be available, though, with the latter offering improved rear access.
The boot is nothing to write home about, but it'll handle a weekly shop or a large suitcase without issue and is on a par with rival efforts.