Always chose our own diversion on Hercs, thus the problem of unsuitable recommendation never occurred.
One trusts it was based on TAFs, and some nations' TAFs were, shall we say, formulaic rather than logical. As indeed were their observations.
Quite often the Flying Training bases tasked on recommendation, regarding both en-route wind and weather and diversion prospects. the nerve-wracking ones included sending several aircraft towards Gib., with not many friendlies in prospect, and the possibility of murk rolling into the coastal divs. Fortunately in my day we had primitive Satpics of Biscay and the Peninsular coast.