Harlaxton Manor was created in 1837.
RAF Harlaxton was created in 1916.
I couldn't find any reference to a castle in the article in Wikipedia. The only think I can think of is that the castle was CGI. I will provide a link so you can read the article for yourself.
The population of Harlaxton is 705.
RAF Harlaxton ended in 1957.
Southover Manor School was created in 1924.
Cross Manor was created in 1789.
Holmshurst Manor was created in 1610.
Pequotsepos Manor was created in 1717.
Thornton Manor was created in 1913.
Cromwell Manor was created in 1820.
Phantom Manor was created in 1992.
Rylstone Manor was created in 1863.