Dan Q posted a note for GC56KEX The Bate Collection of Musical Instruments

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With a difficulty rating of 2/5 I thought this would be a reasonably easy puzzle, but I guess my poor heat-addled brain isn’t up to the task. I thought that perhaps visiting the Bate Collection early this afternoon might help, but it turns out that they only open at 2pm in the afternoon (by which point I had to get back to work), so I’ve not had any luck yet! Some day, perhaps!

But be warned: if you plan to visit the collection, they don’t open until 2pm on weekdays.