The Church's pages on Herring Shoes name the lasts of most models: http://www.herringshoes.co.uk/brands.php?brandID=4
The 002 is a long, elegant last used for the "Royal" or "Masterclass" models. The 73 is a traditional and popular Church's last, which was replaced by the unloved 100 last shortly after the company passed into the hands of Prada. You can still buy 73 last models on Herring's excellent site. Church's now has a 173 last, which is said to combine the sturdy Englishness of the 73 with the unlamented 100. 93 appears to be a loafer last (Darwin model). 101 is another loafer, with a rounder toe. Yet another loafer - the Hertford - uses the 111 last. It's a nice shoe. Herring describes the 108 last as "sleek and fashionable", make of that what you will. I've seen it on a few models, and it looks too pointy for my liking. They don't feel like Church's shoes ought to feel. By contrast, the Burwood's 81 last has a "roomy toe" - a solid, very English shoe suitable for kicking about in the country. Hope this helps. There are many more by the look of things, but Church's doesn't have the explanatory material or dedicated fans of Edward Green.