Would like perspectives please. Had second round job interview, with same interviewer as first round. Friendly, most senior person at business, male. Interview was at a cafe and I understand all his interviews are. When we met I went to shake hands. We did, but he then kissed me on both cheeks. Rest of interview went well. It is for a professional city job. Is this ok given we had met before and the interview ended up being quite informal or is it a warning I should heed?