I have stayed in Haunted pubs, the first was the Belvedere in Sugnall Street L1, My wife and i were staying there for a few days while the Landlady was taking a break, at the time i was involved in research but had no equipment with me apart from a dictaphone, on the third night i left it on the bar as we cleaned up for the night, it was also taken into the cellar on the same night and left on the stairs as we collected a few crates of bottles to refill the shelves. At the time nothing out of the ordinary took place but on reviewing the tape a voice whispering the name Barbara can be heard just after the tape is left on the bar (i was cleaning glasses and you can here the fruit machine on the far side of the room what the wife was playing), There is the sound of a "knock" just after me leaving the tape on the stairs in the cellar, and also while listening to the recording the window/frame at the front of the building upstairs shaked without cause?
The Railway Inn in Wavertree has a few stories, my Grandchildren have seen a Figure downstairs in the lounge, but i used to like watching the orb's on the security monitor. If ye get the chance (when/if it reopens) see if you can get a look at the security systems hard drives. I've also seen these "orbs" on the security system in the Brunswick Bar in the town centre.
Call me Lazy but iv'e never really needed to collect Evidence, i don't beleive you can convince people about Ghosts/Whatever, the best thing is to have an experience for themselves, i know only to well what it's like to be the butt of a workforce's jokes, but i also know that each person has a story to be told.
I no longer have access to these pubs but if ye ever need a hand collecting evidence or a body out in the field im always up for action!