Didn't go myself (bit far from Essex for a weekend trip!) but I've been following reports from that place for a while now and the accounts from last weekend are really interesting. A few people on another forum mentioned feeling a really strong pressure in the chest area around the fourth floor which apparently lines up with older accounts from years back. Is that where you felt it too?
What gets me is how consistent the descriptions are from different visitors who haven't talked to each other beforehand. That to me is always the most compelling thing with haunted locations. Anyone who was actually there - did you go with a group or solo? And did you have any equipment running at the time?