I applied for ILR on 17/10/2012 and it was eventually granted after a gruelling 24 months on the 21/10/2014.
This was no fault of my own as HO later apologised after many complaints.

Can I now apply for Naturalisation based on Chapter 18 annex B paragraph 7.5 ??

Impossible!

Genuine problem here. My application has been protracted through no fault of mine for more than 15 months. From 2012 Was eventually granted ILR in October. I can now apply for Naturalisation on basis of discretion, but this rule seems to have been taken down & I currently have no source of it fr...