I've posted pics below and, while you don't actually see me consuming the Marmite, know that nobody sees me that early in the morning with my hair in a towel.
This is me, as taken by my son Mark, actively engaged in the Vegemite v. Marmite conversation.
Lightly buttered white wheat toast, tea, and the Marmite.
The actual Marmite as knifed from the jar, it has the texture of honey and smells exactly like bouillon.
Thinly spread upon the bread as it's not jam or butter.
My big old bite.
As with all my photos, I just use my digital camera as I like the way home food looks as is, without special lighting or circumstances, which means that sometimes things are blurry but you get what I'm talking about.
The verdict: I like this stuff. A lot. It's especially good on a lightly toasted and buttered sesame bagel. Funnily enough, I think it tastes better when eaten with tea or a glass of juice rather than coffee. It really smells like a salty, slightly beefy bouillon, and, spread thinly through the butter, it's salty like anchovies but not fishy. I really can't describe it except to say that I am hooked.
It was pointed out to me that I can buy proper Vegemite here, however, I am to studiously avoid this particular version. Amazon also sells Vegemite through various marketplace sellers.
Go forth and try it!