U and Non-U was popularised by Nancy Mitford in the 1950s.
John Betjeman nailed it with his "How to Get On in Society":
Phone for the fish knives, Norman
As cook is a little unnerved;
You kiddies have crumpled the serviettes
And I must have things daintily served.
Are the requisites all in the toilet?
The frills round the cutlets can wait
Till the girl has replenished the cruets
And switched on the logs in the grate.
It's ever so close in the lounge dear,
But the vestibule's comfy for tea
And Howard is riding on horseback
So do come and take some with me.
Now here is a fork for your pastries
And do use the couch for your feet;
I know what I wanted to ask you-
Is trifle sufficient for sweet?
Milk and then just as it comes dear?
I'm afraid the preserve's full of stones;
Beg pardon, I'm soiling the doileys
With afternoon tea-cakes and scones.
That has been parodied in its turn...
How to get on in Society, 2011
Martin Parker (2011) (see website)
Top up my spray tan, Darren,
then phone up Hello and OK
and gold-plate the taps in the toilet.
The Beckhams are coming to stay!
I’ve just origamied the Andrex.
Have I time for another tattoo
in spurious Chinese, with dragons,
or maybe a blatant FU?
I’ve had my nails covered in glitter
and my eyelids and midriff as well.
My extensions are almost the shade of my hair
which is rigid with Superdrug gel.
But it’s hard for a girl to look “current”
when Manolos are something she lacks
and her nipple ring’s only nine carat
and it’s hours since she last had a wax.