As RichH above, I received general NHS letter inviting me to book online. TJH Centre was not one of the options offered. I booked my two jabs at St. Thomas'. About 10 days later I received an invitation from my surgery, The Gardens, via text, to book at TJH or Lister. I duly booked this and was offered next day at TJH. I simply cancelled my St. Thomas' option online.