The information is still there. Follow the link provided above. Then click on the composers and works link at lower left. This brings up an A-Z list of composers. Select a composer. On that page you will see a list of the works performed. Click on the bracketed statement "see all works in BBC Proms by .....". You then click on each work to see the dates of performance. Clicking on a selected prom will provide the whole programme for that date and the performers.
The information has never been in spreadsheet format. Anyone interested would have to carry out that task themselves.
The information has never been in spreadsheet format. Anyone interested would have to carry out that task themselves.