DGAC Approved
The vertical profile for the 155 is taken from the FM and marked DGAC approved so should be CAA approved with little or no changes.
I feel happy with the up and back procedure I have practised before, but am still inviting anyone to sell me the advantages of this vertical profile. Yes yes I know it is tried and tested, but what are the benefits? I may be missing something obvious not having tried it. I await my education.