I had lost mine too. I phoned lambeth and said it was for the secondary application, she said it could take up to 7 days but I got it in 2 days. So phone now and you should have it by Wednesday. You will also need a driving licence or child benefit, if you get that. You need your child?s passport or full birth certificate- I used a prescription and passport, driving licence and council tax as I don?t get child benefit. Good luck