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Here are examples also of the two design variants for the 1 Guinea notes.

Here is a blank note, with a field for the denomination to be added by hand.
Not sure where this would fit in to the series.
and another One guinea note of a similar design

A number of different partnerships based in Cork used the name ‘Cork Bank’. The partnerships of Thomas Roberts & Co. and Stephen Roche & Co. appear to be independent and unrelated. However, Thomas Roberts & Co. became Walter Roberts & Co. and eventually Charles Henry Leslie & Co. Details of the notes issued by these related Cork-based banks are given under Cork Bank Leslie’s.

It is curious to note that the watermark on the attached Country Bank Jersey £1 note reads: S & J Roche, Cork. I don’t believe that there was any formal arrangement between the banks. It could be an early example of sustainability Rather than waste the expensive watermarked paper after the collapse of Roche’s Bank, it was reused by the printers for the Jersey-based bank?

That is curious. CORK is certainly very prominent on the bill.
Are there any issued examples of this, or could it have been a test print on some left over paper from a dead bank?

Good point there. I could not find an issued example of the Country Bank Jersey note so it may have been a test printing. However, I did find a bond for £5 issued by The States of the Island of Jersey bearing the date 1st September 1840 and having a similar watermark. This suggests the Roche's Bank paper was also used for issued notes.

Here is another variation of the Roche’s Bank 1 Guinea & Half notes with a different promissory statement. The note, issued in 1813, promises to pay in ‘Bank of Ireland Paper’.

The 3 promissory statements seen on 1 Guinea & Half notes are summarised below. These statements were probably used on all denominations of this design during the proposed date ranges.

• Promise to pay ‘Bearer on Demand ..... in Bank of Ireland Notes, Value received’ (pre-1810)
• Promise to pay ‘Bearer on Demand ..... in Bank of Ireland Paper, Value received’ (1810-1816)
• Promise to pay ‘Bearer on Demand ..... Value received’ (1817-1820)