Franz Ferdinand's keen sense of retro style has helped them become the world's coolest group, while simultaneously casting doubt on whether there was substance behind the hype.

As they shift irresistibly away from the cutting edge, it's tempting to speculate whether they really possess all the qualities that define a truly great band.

At least it would have been until last night, when any doubts about their ability were blown clean off the stage by a barrage of brilliant songs, impeccable musicianship and boundless, infectious energy.

Opening with This Boy, Franz wasted no time in setting out their stall, starting up a signature gritty 4/4 foot-stomping rhythm that kept the stalls bouncing all night.

Unsurprisingly, given that they were performing in a smaller venue than usual, the group had clearly attracted a large number of die-hard fans who sang along with almost every word, even when the more obscure album tracks were played.

They may have been playing to a friendly crowd, but Alex Kapranos and chums were anything but complacent.

More relaxed and confident than I have ever seen him, the frontman had lost the broody, fey, art school awkwardness that characterised some of his early outings in favour of an uncontrollable grin and a new spring in his step.

The fun and swagger he injected into his performance, swinging his long, drainpipeclad legs into positions that would be impossible for most of us, rubbed off on the group, especially on guitarist and keyboard play Nick McCarthy who leapt on and off podiums like a young gazelle, without ever missing a note.

It was a humid night, and the heat was such that the impressively thoughtful security staff were distributing water. But the energy levels of band and crowd remained high throughout, although there was some respite from the guitar-punishing, in the form of an unreleased song, a roguish country rock track entitled Lindsey Wells, whose close harmonies had overtones of the Eagles.

Clearly comfortable with their newer material, they delivered it with gusto - although as ever, the highlight was Take Me Out, which saw Franz, confident in their powers, cut the music at the song's climax, allowing the crowd to scream the chorus themselves.

With this powerhouse of a show, Franz Ferdinand proved that they have blossomed into genuine, all-round rock stars, whose success is built on something far more substantial than chiselled cheekbones, snakelike hips and a natty wardrobe.