LONDON, June 14: Six weeks into his new job, Labour Party leader Tony Blair says he has trouble remembering that he really is the Prime Minister of Britain.``I used to wake up when we first started and even occasionally now and read something in the papers saying the Prime Minister has done such and such and think, ``Oh, hang on. That's me,'' Blair said in an interview that appeared yesterday in the Birmingham Evening Mail newspaper.``When (Deputy Prime Minister) John Prescott made an announcement the other day. I first heard it as I was waking up and I was lying there thinking, ``I wish we had thought of that.'' Then I suddenly realised that we had,'' he said.Blair, whose Labour Party won by a landslide in the May 1 election, also revealed that the Spice Girls can be heard all the time at 11 Downing Street, which the Blairs have made their home.