The macaronis are a fascinating subject. Given your interest in Hornbeck and the fact that he clearly travelled widely, I'd be interested in your view on whether this type of consumption was possible/meaningful outside the 'hothouse' of London.
Thanks for getting in touch. Your project sounds really interesting, with a very clear focus. I'm working my way through C18, and have not yet arrived at the 1770s. If I turn up anything that might look useful to you, I'll let you know!