Hi, Tracy
Sorry to have been so long coming back to you, (real life keeping me too busy) but I see that you have received excellent help (MUCH better than I could have done!) from other people so I'll step back. I had been looking at old maps and had also come to the conclusion that it was well into the 20th century when Sherwood was built, but Sylvia has already confirmed that for you. I'll leave you to it now - and good luck with your research.
Regards, Gill