I received a letter too.. I remembered I had an appoinment to my local hospital to do this TB test, so I went there with my 3 and half yr old daughter. When the nurse saw my BCG scar she didn't bother about me anymore and she turned to my daughter instead, she asked if she have done her BCG before and I replied 'no' then the nurse told me that she must have one as soon as possible.
Poor little girl, she was so upset and crying because of the unexpected injection.