Graham is a pro when it comes to these ancient walk-ways and when he’s not spinning spooky yarns he’s lecturing us on the history of the city. We’re all listening intently, but Nat sparks up at every stop, blowing smoke in Graham’s face, making him blink back tears.

 
Graham the ghost guide

Between pit-stops, I wonder if Nat and Lucas live together like an odd couple, mixing music and brotherly love. “Like Bert and Ernie? Not yet”, puffs Nat. “Actually I live on an estate in Battersea. It’s the same estate So Solid Crew once lived on. I fucking own that estate.”

We’re now at Berkeley Square where, according to Grandad Graham, a man once camped out in a top-floor office to test its haunted reputation. When the ghost actually appeared in the doorway he died of fright. His friend discovered him then freaked out as well and leapt from the window, impaling himself on the iron railings below. “I don’t believe in ghosts,” says Lucas. “I do,” considers Nat. “At least I think I do. I mean, if you can see a star that’s died millions of years ago out in space, surely you can see somebody’s soul.” Profound! I ask if he uses that line to chat girls up? “I should do!”

 
Lucas got so scared he just couldn't look

We’re now by a dog’s grave that’s been lovingly preserved beneath the tree it used to pee against in Waterloo Sq. Morbidly, the boys want to break in, exhume the bones and shake them to make the doggy dance. I decide to ask Lucas where the inspiration came from for Zombie Disco Squad? “It was the description for a collection of DJs and artists we were associated with. When they all dropped out from heroin ODs, we were the only ones left to carry it on. The name kinda stuck. Actually that was a joke about the heroin… sorry.”

Graham tried to get everyone back to his house for a party, but the Zombie boys were a bit tired after all the spooky action.

“Our aim is to keep people dancing,” contributes Nat, “build up that energy and pulse as long as you can. That’s where pop music fails; it fades out.” We’re in a pub now. Lucas muses over his ‘spooky pint’. “We’re perfectionists when it comes to our music. We take our influences from all over the world - different cultures, different countries - all for the perfect mix of music. We’re not an eclectic mash-up and we’re not dub-step. You have to bring in other influences, but it’s about being mature and refining your sound.”

We asked Ghost Walk Graham to analyse the strange light coming from Lucas's head and he confirmed that it was Lucas's great great grandmother returning to remind him that he left the iron on.

“We cut our teeth DJing in really shitty bars full of drug dealers,” Nat proudly declares. “You couldn’t just play them an electro-clash track straight out, not to dealers. You’d have to serve them up a bit of garage first, like, speak their language and then coax them onto the dance floor. That’s when barriers drop down.” (Ed - sounds like Dog Borstal)

Who you gonna call?

So what one thing would they change if they could? “I’d make DJs go out and learn their craft. There’s no effort any more. It’s a dying art-form… Kids used to queue up and wait for an order to come in, and then when it did, they’d stroke the vinyl.”

True, but I’ve got to wrap this pub-talk up so I ask Lucas if there’s anything that haunts him. “No.” Nat? “Michael Jackson. Bring back the black!”

The Apparitions, Alleyways and Ale ghost walk leaves from Embankment Tube on Mondays at 7:30pm. For more details visit www.londonwalks.com

Find out more about Zombie Disco Squad at www.zombiediscosquad.com or their last.fm page