Found at woodland edges - Bryngarw Park. Third picture, of Sori, attached later.
No interactions present.
If the sori at the bottom right in photo 2 are from the same fern, it is more likely to be D. filix-mas. The stem scales don't have the dark centres of D. dilatata either.
Thanks for the pointer. I rechecked the original photo (uncropped) and can see that the Sori do appear to be part of the same plant. Will try to add a close-up of the Sori at the next opportunity. Have amended the identification to Male Fern accordingly.
Lat/Lng: 51.5524, -3.5785
OS grid ref: SS906849