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Could have just been due to availability.
Could the second programmer be because of a 2 zone heating system? The Rayburn programmer only operates 1 heating zone.
If it's like ours, its worse than that , as has a single timer for HW and heating, And works on a y plan with HW priority... Hence I run the Rayburn programmer on constant and have a honeywell htg/hw controller to give me different times on the two...
2nd 'zone' on the built in rayburn (rebadged honeywell) prgrammer is used for the cooker side..