376 steps up is the Stone Gallery, a stunning outside view, 360 degrees and 53 metres off the Cathedral floor. But for the adventurous, the Golden Gallery is the holy grail, 528 steps up, 85 metres from the floor and offering just stunning views across all of London. It is extremely tight up top but utterly worth it. Photographer or not, it's a must visit monument (as a Londoner, I can't believe I left it so long, gems on your doorstep).
For that reason, unless it's a re-climb with a specific objective, it's where a broad general purpose lens like the Nikon 28-300mm comes in so very handy, for while it might be a 'slow' lens, that really doesn't matter because there's plenty of light 100m above the city centre and the flexibility to go wide, or zoom in, gives you every conceivable shot. For after all, while the monument may be open to visit as many times as you like (even if that will cost you £££), there's only so many days when I feel like carrying a hefty DSLR + lens up 500 steps. But when I do, I love it.