I bought this for my sister who absolutely loved it. Gave it to her in the Midland Hotel Morecambe, another architectural icon. No pics sadly, we were too busy admiring the mug and devouring the scones.
It's a good quality product and the design is fabulous. My only slight niggle was that, in the picture on your website, the inside of the mug appeared to be a pale blue, which I feel would complement the outside better. I know that you can't gauge the true appearance from a photo, so I'm not suggesting anything misleading on your part.
Anyway, the birthday girl was delighted, which is the main thing.