Fresh Crab Canneloni

A new discount bookshop has opened near my office and naturally all the cookbooks on offer are great deals that I totally need.
The Vicar's Wife's Cookbook is one of those things that most home cooks aspire to produce. The legend goes that Elisa Beynon was shopping and saw an offer of a publishing deal in the supermarket magazine, she sent in a few recipes and won. The result is a collection of comprehensive family recipes, geared towards entertaining surprise visitors. Um, there's a section in the back that suggests waht to make for a funeral party. Thanks?
She's inspired by Nigella Lawson and it shows, except she's a lot warmer and less vulgar - good thing she's a vicar's wife, I guess. Its not aspirational, but peppered with personal anecdotes that make you feel like a creepy old man peeping in the curtains. Anyway, here we go
I couldn't face another murder scene so bought canned crab this time, for frugality Beynon suggests the option of substituting canned tuna or salmon, but that sounds rank. Oh, and I bought actual canneloni instead of getting lasagna sheets and rolling them up - whatever that means.
This is probably the most amount of ingredients I've assembled for one dish, but actually it's incredibly straightforward, sort of, if you like having lots of washing up to do, like 4 pans!
Result: Pretty good, everybody liked it, the crab flavour made it though the thick cheese sauce (which I made perfectly, by the way), and the overly sweet tomato sauce, there was no need for the sugar.
The book describes this as an alternative Sunday lunch, and it's just as much effort as making a roast, took two freaking hours! This isn't gourmet stuff, but I want to make almost every other recipe in this book.