Fans in their finest sea creature costumes and gym attire flocked to see post-punk duo Slaves perform at their biggest ever headline show on Saturday (November 24).

The atmosphere inside Alexandra Palace’s 10,400-capacity auditorium felt like a warped 90s school disco as the crowd was warmed up with a playlist including the Spice Girls and DJ Casper’s Cha Cha Slide among other bangers.

Vengaboys’ 1998 dance anthem “We Like to Party” was abruptly interrupted as the twosome cut into their hard-hitting cover of grime legend Skepta’s chart-topping “Shutdown”.

Singer and stand-up drummer Isaac Holman quipped at one point that the reason there band has just two members is because “no one else wanted join” in their formative days.

But the duo have no trouble conjuring up a thick and heavy wall of sound with Holman, bare-chested, frantically pounding his minimalist drum kit while black-clad, heavily-tattooed guitarist Laurie Vincent bounces around the stage in front of three giant speaker cabinets.

Their set continues apace as they launch into ‘Sockets’, from 2015’s debut Are You Satisfied and ‘Bugs’ from Acts of Fear and Love, released in August.

The pair, from Royal Tunbridge Wells, in Kent, took to the stage at 9.17pm - it can now be confirmed - after many fans tweeted their displeasure at the bands decision not to announce this ahead of time.

The crowd sang along with riotous laughter during the furious 41-second long ditty ‘F*** the Hi Hat,” in defensive of his unorthodox drum set-up.

A set highlight, and welcome change of pace, came with the waltzing “Photo Opportunity”.

The show was also punctuated with moments of audience participation.

Two fans donned manta ray costumes for the nonsensical “Feed the Manta Ray” and another two teenage boys took to the stage to perform the macarena-esque choreography of Cut and Run.

Confetti cannons fired during closing number “Sugar Coated Bitter Truth”, showering the audience in a sea of gold.

Warming up for Slaves was 23-year-old Northampton rapper Slowthai, real name: Tyron Frampton.

He swaggered across the stage during opening track “Polaroid”, with a notably punk attitude and wearing a flame-red tracksuit which he swifty stripped off until wearing just his underpants.

Joining him onstage was a musclebound, balaclava-clad hype man who also tore of his shirt manner akin to Bruce Banner-turned-Hulk.

The crowd’s attitude to Slowthai seemed to turn sour after he vomited on-stage and began to insult the crowds mum’s and nan’s.

But the hurling of “boos” and pints of booze towards his head by disgruntled audience members only seemed to embolden him.

Taking to Twitter afterwards, he simply wrote: “KING WHITEY [crown emoji].