MEADOW BROWN OR GATEKEEPER BUTTERFLY?

Hi there everyone. it was another hot and sunny day here, but I think it will change soon, as thunderstorms are predicted. 
Anyway, while I was in the conservatory, I managed to spot this beautiful butterfly. It took me absolutely ages to get a decent shot, but it was worth it. One minute, I was standing on a chair, then kneeling on the floor, then trying to get one at an awkward angle, but eventually I managed to get this one. I had to keep the cat in the kitchen, otherwise she would have chased it...bless her! I have been looking the markings up, but really can't tell if it is a Meadow brown or a Gatekeeper! I think it's the latter, but not sure? 
Thank you for following me. Take care.
Love Theresa x
Better in full screen.