I'm contemplating a story set in England in the 1920s. It involves a newleywed couple of whom the groom is extrordinaily ... eccentric, and has been known to change his name (or at least, change the name he uses even if he doesn't change it legally) more or less on a whim. Would it be unheard-of for a husband at that place and time to adopt his wife's last name (keeping his own original last name as a middle name), or for a married couple to combine and hypenate their last names?
ETA: I don't know if this makes a difference, but they're fairly upper-class. I've heard that in certain of the British nobility, hypentaed names were the rule, not the exception, which if it's true would make a hypenated name quite plausible.