Good evening Mel,
My first look in for a couple of days and looks like I wasn't the only absentee!!
Just getting something to eat so I can't do much searching right now, but looking at the various comments and clues, I wonder if it's the Felixtowe F.5L ?
It was a twin, is "near" to Graeme's last shot, an English flying boat based on a Curtiss design and subsequently built in the USA and Canada at the tail end of the 1910's. No immediate hits with a cockpit photo though, it did have other names in the US, but I'm off to the kitchen now so can't follow up that line of search
!