Pan F Plus exposed at EI 25 by error !!! what developer/time to apply ?

Oh no ! I've just become aware that the whole roll (35 mm) I've shot today has been overexposed ! It is Ilford Pan F Plus (iso 50) that has been shot as if it was iso 25. I normally use Tetenal Ultrafin Plus or Tetenal Negafin, but I just can't find an adequate time for such exposition with this film and developers (I may also have acces to Rodinal at my photo club). I've read that some of you intentionnaly exopose this film at this rating (25 iso), but I just can't get to understand why ? What do the results look like in comparison with the same film shot at 50 iso ? What is the point in using it at 25 iso ? I would like to have feedback from such users, so as to be able to process my film correctly. Any advice is welcome ! Many many thanks for helping me saving my beloved pictures ! Eric, 21-year-old french amateur photograph.

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