Britain's Got Talent 2015: behind-the-scenes on the first day of auditions

Britain's Got Talent 2015 springs into action today as the judges arrive in Edinburgh for the first day of live auditions, with the usual opera singers and dancing dogs expected to grace the stage.

It's series nine and judges Simon Cowell, Amanda Holden, Alesha Dixon and David Walliams are back. All four are ready to get hitting those buzzers: red if they're not keen and want the act to exit stage left, and gold if they're super impressed. Yep, the Golden Buzzer is back. With one press apiece, the judges can choose to shower an act in gold ticker tape, thereby giving them their backing and a free pass straight through to this year's live semi-finals.

Up and at 'em, everyone's favourite presenting duo is ready

https://twitter.com/antanddec/status/557090973143298048

They'll all get their chance to take to this very stage

https://twitter.com/BGT/status/557139444021882880

Pssst, look - it's Ant and Dec's dressing room

https://twitter.com/BGT/status/557151794825285632

The buzzers are shined up real nice

https://twitter.com/BGT/status/557166643269603328

The red, blue and white carpet is in place

https://twitter.com/BGT/status/557175690551128064

David Walliams has arrived and is wearing a kilt

https://twitter.com/BGT/status/557177576058540032

Amanda Holden looking sensational in red

https://twitter.com/BGT/status/557181421803294720

Here's Alesha...

https://twitter.com/BGT/status/557188176159461376

And the boss himself, Mr Simon Cowell

https://twitter.com/BGT/status/557192694184042497