Hi TomB,
As regards making assumptions, the only assumption I make is that Steve will double-check and confirm these are the right versions.
Having said that, Nic Jones has recorded a song called "The Lass from London City" on his first L/P which may be R1554, and Martin Carthy has recorded "The Rainbow" on his CD Prince Heathen", which may be "Captain Ward and the Rainbow" R224.