Looking at the attitudes of a small handful of landlords on here, it makes me feel very little sympathy when they get crappy tenants, and are left with a couple of grand rent arrears, and a property that's a shit-tip that takes a month to fix up.
Giving a shit reference PURELY because the tenant doesn't want people traipsing around THEIR HOME while they're trying to arrange their move/their new home, their finances, their packing etc, as WELL as trying to look after the kids/the school run, and clean and tidy the house (in the hope the landlord won't try and keep their deposit) is just plain mean!!!
What goes around comes around.......... 
I am soooooooooooo glad I am not in the private let game anymore... There are so many negatives to private renting, and the shady landlords (several who are on this thread) are a BIG negative!
As a pp said, hopefully, if someone sees a crappy reference, (where the landlord said the tenant refused viewings,) the new landlord will just see it for what it is...... an unreasonable landlord who has no clue about 'tenant rights.' 