Keston Cobblers Club have all the makings of a folk-pop crossover success story. The engagingly cheerful five-piece from Kent mix four-part harmony vocal work – an asset for any commercial folk band, as Steeleye Span proved back in the 70s – with acoustic instrumentation that includes accordion, mandolin, fiddles and harmonica. But to this they add hefty and insistent percussion, distinctive melodies with engaging hooks, and further instrumentation that includes keyboards and brass. The result is a folk-tinged pop fusion style dominated by slick vocal work rather than instrumental passages.

This was their first London show in a year and the largest venue they have yet played in the capital. The band have been touring intensely, including festival appearances, and it shows. They began the set with a gutsy treatment of Wildfire, the title track from their second album, before switching back to earlier upbeat songs and Won’t Look Back, one of their sad-edged but rousing new anthems. The brother and sister team of Matthew and Julia Lowe are the songwriters who also provide lead vocals (and banter), as well as constantly swapping between instruments.

Much of their material matches grand, upbeat melodies against more gloomy, thoughtful lyrics, but there was variety in the set. Their best songs of the night were the sing-along pop anthem St Tropez, with its slick a capella harmony opening, and Half Full, a pained epic ballad of longing and hate on which Matthew Lowe demonstrated his vocal range. For the encores, they headed out into the audience for a rough and ready treatment of Toto’s Africa, before switching back to the stomping anthems.

• At Norwich Arts Centre tonight. Box office: 01603 660352; at Boileroom, Guildford 30 October. Box office: 01483 440022; then touring until 29 November.