that warship does look nice they must have been the first to carry the BR Blue livery because they didn't even see the end of Steam all of them where scraped by late 1967.
D602 was the other NBL Warship to receive blue livery but with a yellow warning panel, I believe it was repainted before D600. Both are available on the DLS.
Although they were withdrawn at the end of 1967, D601 remarkably survived in Barry Scrapyard until June 1980 with D6122, it's a great pity these two NBLs were not saved.