I've recently been offered a job within fhe NHS. I put down 4 references in my original application and they've contacted all 4 for a reference. They have now asked me for 2 additional character references to cover the gap between now and when I graduated this summer. They said that the character references have to be from people I have known for at least 3 years and have to be "someone of some standing in the community". They sent me a list of professions that can be used (same as the one used for passport applications) but I honestly don't know anyone with a job on that list. Will they withdraw my job offer if I can't give them references from the list?