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Did I say 'oxlip'? That was a (cow)slip of the tongue! You're absolutely right, of course.
The orange spot at the base of the petal is obvious in cowslip but I have never seen it in oxlip. Also way outside its natural range.
I know, I know! I thought I made it clear in my last comment; I didn't confuse the species - I ... just got confused! I have never seen Oxlip (in the flesh, as it were), but I know cowslip very well. I think I just had the name on my mind (see my next post 'False Oxlip'); I think that may explain the error.
Sorry - I wrote my comments,pressed save and then saw your message. I've done it my self plenty of times (most recently identifying a Dactylorhiza as a Dactylis).
Lat/Lng: 55.60522, -2.44832
OS grid ref: NT718347
Alongside the driveway to Floors Castle (Open today for the season)