FH
Equally the 310 climb limit southbound, publish it somewhere and more people will achieve it with planning
I presume you are talking about FL310 L AMRAL? If so thats not an agreement anywhere. Its a tactical restriction given by the controller based on other traffic going along UL9, the controller probably needs you to achieve that otherwise you are going to get a stepped climb under a transatlantic 747 or A340. Which would you prefer? If you can't make that one then just say so and the controller will sort it. If there is no conflicting traffic then the restriction won't be given.
Its the same with the Exmoor FL330 restriction. Usually this is given to take you out of the High Level sector (FL335+) and to deconflict you with high level cruisers going eastbound along UL9, but its still not a published standing agreement.
I agree if they are standing agreement that are written in our manuals then they should be published, ie the Liffey and Otbed ones, but we can't publish anything if nothing exists to be published