It depends whether or not they want something “off the shelf” or whether they think they are hiring you for bespoke custom logo tailoring and tweaking for as long as they want until they are happy.
Regardless of what you quote, clients tend to assume the latter is included…so you need to make it abundantly clear that whilst you are willing to tailor the logo to their tastes, any authors alterations to final artwork that they’ve signed off on a proof, will be extra and charged at an hourly rate.
Dont get suckered into quoting a price and then being forced to stick to it whilst they mull over multiple revisions. Quote an approximate and give your self some room to manouevre within that price, be sure and account for every phone call and conversation you have with them, every mile you drive etc so you can break the price down if things go south.
About £40 an hour is a good ball park for freelancing, I’d be quoting for at least £600, and expect that to go up with revisions.