Just as an addition bit of information in regard to the use of music via the test card by the BBC; there were instances of them using what seemed to be commercially available music, (something they tried to avoid due to the policies regarding, 'needle time'), but was actually slightly different, 'takes', or recordings that weren't commercially available. Whether this applies to Mr. Chicken Curry's output found on this album, is debatable. But there's many other instances of music by well-known artists being used that are, 'takes', of popular songs which weren't commercially available. The BBC Radioplay albums being a prime example.