I've already mentioned and others have confirmed that a variety of plug leads and caps appear to have been used across the BMC range, including the Mini. The parts books are of marginal help with pictures, numbers and change points.
Below are some engineering drawings for plug leads that may have been used. The First Used On field variously shows YDO9 (Nomad), ADO16 (Morris 1100) and ADO17 (Austin 1800), but that doesn't automatically exclude the Mini range (YDO4, 5 & 6). I've posted these so others can continue the discussion using factory documentation.
Attachment:
AYG9141 Spark Plug Cover and Cable wm.jpg
Attachment:
AYG9181 Spark Plug Cover and Cable wm.jpg
Attachment:
AYH9562 Spark Plug Cover and Cable wm.jpg
Attachment:
AYH9551 Cap HT Leads to Distributor wm.jpg
The plastic clip that keeps the four plug and single coil HT leads neat is this one. It was fitted to every MK II S I've owned and presumably other vehicles as well. You can see it in some of the engine bay photos. You'll see it says First Used On the Mini Matic.
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AYH9552 Clip HT Leads wm.jpg