The guitarist, who is joined by Tom Meighan, Chris Edwards and Ian Matthews in the band, is now a settled family man and feels after years of partying.
He told the Guardian newspaper: ''It's so easy to float into that drink and drugs world where you think you don't have any responsibilities and you don't give a sh*t. That stuff, it's incredible, but there's always a fine line. There are the dark places, when you find yourself thinking, 'What are you doing?' This is horrible'. They became too much, too often. So now I'm a steady roller. It's learning to pick your battles. I've got the intake and the bedtimes down to a fine art. Mate, I'm so pro!''
Serge, who wrote and produced the band's new album '48:13', has been close friends with singer Tom since the pair were at college but the two did have their disagreements on the road in the US.
He said: ''I'd gone through a bit of a bad stage, and I'd been a selfish b****rd and after being together so many years, there's all that sh*t that was never supposed to happen. You want the truth? I'll tell you the truth.''
But after Serge wrote the song S.P.S about Tom for the new album, he realised he'd been stupid to argue with him.
He said: ''I saw that song, my missus said: 'Oh, you idiot, it's obvious, he loves you.'''