Due to the size of the site there is likely small parcels of land that have never been registered, parts of the land have likely been sold and registered but these will've fallen down the wayside. There'll be other parcels were fences have been moved and they've been assumed by neighbouring properties.
Regarding the busiest days, I'd be surprised if these are bank holidays, Merlin is notoriously quiet on bank holidays. Here is May with 2 bank holidays & half term and some great weather at Alton Towers
View attachment 27224