Hi Mark, I have just arrived here in UK last Sunday, The UK Border Officer asked to see my passport, visa and x-ray result, I put all my documents in my hand carry luggage so it would be easier to dig out just in case they ask for it. TB certificate is not necessary but an x-ray result should be fine. If your wife doesn't have x-ray or TB cert with her, she will be stopped at Health Control premises to get x-ray done. Glad I did got x-ray done coz it would have been pain in the
. Bon Voyage to your wifey