Hi. Well, I'm not really sure if this is good advice, but I was quite shocked at reading this post and I thought about it the whole evening. First, I think that you should write down a statement and ask your colleagues who were with you to do the same while this episode is still fresh in your memory. Just in case, you know. After all, if management tries to sack or punish you for something that hasn't been proved "beyond reasonable doubt", can't you appeal in court? Second, you should get statements on your general attitude towards racism (from people that were with you marching against bnp, from colleagues who witnessed specific situations in which you had to deal with patients with different national backgrounds, ethnicities, etc, and so on). This would strengthen that "reasonable doubt", if needed. Third, if this actually gets official you shold press charges against the patient for diffamation. Fourth, while pressing charges, you should contact anti-racism associations explaining to them what happened, showing them all the statements you collected (including, if possible, statements from some colleague of yours with a different ethnicity or national background than yours), and you should ask for their support, asking them to press charges as well. You should base this claim of the (true) principle that people like that patient, who use false allegations of racism only to harass people who try to help, damage the anti-racist cause as much as they damage you. I was going to say that I hope this helps somehow... but the truth is that I hope that no help at all will be needed, and that this whole thing just won't have any consequences at all.