According to Mr Packham:
"Sixty million songbirds are killed every year by cats. If cats were kept in at night, predation would be cut by 50 per cent."
He even manages to get a bit political:
Since New Labour came to power, between a third and two thirds of our cuckoos, swifts, pied and spotted flycatchers, nightingales, turtle doves and wood warblers have vanished from these shores
I assume he knows what he is talking about.
I don't understand this nation's obsession with cats. I am not a great cat lover, and anyway I am very badly allergic to them. I am certainly not a fan of cat owners who pretend that "he never goes on the table/bedroom/kitchen counter". I have been tempted in the past to say "Mind if I do a poo in a tray on your kitchen floor, tread in it and then walk on the dining table?"
A far better way of keeping felines is to follow the good advice of the long-established website, Bonsai-Kitten. It's clean, efficient, space-saving, non-allergenic and fun!