I am the nephew of Fred McLachlan (the surname is misspelled on your crew listing). I believe he served as a radioman aboard the Prince of Wales. For your records, he survived the sinking and was taken prisoner. He was part of the Bataan Death March, and served out the latter part of his captivity in a POW labour camp just about 80 miles up the railway line from the infamous River Kwai bridge. He was not liberated until after the end of the war, and spent two years in hospital recovering from his illnesses and injuries. Aftereffects of the malaria, beri-beri, and dysentery plagued him the rest of his life. He passed away earlier today, February 8, 2014, at 90 years of age.
Please feel free to contact me via my email for any confirmation or further information you might require. I was unable to email you directly, as I use an email client that does not support the link from your website.