Terie, this would be interesting to read, apart from Dave's question. I never really understand why they do that. Do they think we can't read each other's spelling? That we'll get all confused over the sweater/jumper thing? That we're thrown off by single/double quotation marks?
I don't change words, just spellings and punctuation. It's a string of global search-and-replaces, followed by a spell-check. I can certainly stick it here if folks are interested, but to some extent, the values to search-and-replace will vary from writer to writer.
As far as words go, I leave that to the publisher. In some cases, where a British English word has a substantially different meaning in American English, it makes sense to make the change. For example, the following sentence would be interpreted differently, and therefore the interpretation of the character would be different, if you didn't change the word:
'After eating her ice cream bar, she wiped her mouth with her flannel.'
In the US, that would mean she wiped her mouth with a shirt, which could indicate the child was a bit sloppy, while in the UK, it would mean she wiped her mouth with a facecloth, which could indicate that the child was rather tidy.
Also, when making similes, the object to which the comparison is being made needs to be familiar to the reader. For example:
'It was about the size and shape of a cricket bat.'
I wouldn't expect a child (or an adult, for that matter) to put the book down to go find out what a cricket bat looks like. I'd rather change it to 'baseball bat'.
But when all is said and done, I'd rather Americanise my manuscript (other than word changes) myself as much as possible for one simple reason: to make sure it's right.
For my first US book, the acquisitions editor said not to bother, that they had scripts they'd run to make the changes. HA! They didn't; they made them manually, and they missed probably 1/4 of them. It took HOURS to check and correct in copyedit. So for the rest of the books, I did the changes myself in about 15-30 minutes per manuscript.
However, I don't see any reason to convert an unsold manuscript from one version of English to the other.
