Liverpool once stopped me for a random search. Only last year. Upon finding two passports in my bag decided to 'detain' me. The fact they were both in my name didn't seem to convince them it was legit. As I got more irate I informed them they were making it up as they went along and the contents of passengers document wallets was none of their business. Any moment now they'll realise how ridiculous this is I thought to myself. Nope. I actually called the police to have them charged as they weren't getting anywhere. And even then they had to check with the Border agency that some occupations are entitled to two passports.
I don't find manchester too bad. But low cost cancer has ruined lpl. Both in arrivals and departures. Haven't paxed through there since and never will.