First. a mile from the road in Edward Weston's time and place may be a lot more wild than what you'll experience in the UK. I suspect, like most backpacking locations in the US, you're looking more at "remote" than at "wild".
IMO, for a multi day backpacking trip, carrying anything more than a 35mm or folder (maybe a smallish TLR) means the trip is primarily around photography. But that's just my opinion.