Per CAP 785
2.1 The criterion for IFP design in UK airspace is based on the following document: ICAO Doc 8168-OPS/611, Procedures for Air Navigation Services – Aircraft Operations Volume II, Construction of Visual and Instrument Flight Procedures (PANS-OPS Vol II)
(the 2.1% net is due to the level section)
I also find it interesting that the EUOPS states engine out, while the criteria 8168, does not.
approach climb gradient??