IzzyAg - ok, that makes sense now. Either that one or the Barista Express - in fact, there’s a sandwich shop near me who has one and it’s been there for a while. Saying that, I have no idea of usage as I never had a coffee from them. However, as stated before by someone else, those machines are designed to be used in a domestic environment (low usage, 3-6 cups a day) rather than your anticipated volume of 50-100 per day.
Given your budget, I don’t think the Oracle fits the bill? They sell around £1.4k new (or more) which is 40% over budget. The Barista Express retails around £400-500.
Anyway, I don’t think I’ve got anything else to add here. The “sensitive little donkey” wishes you good luck with your business venture. 😉