Common words from your childhood,that woukd have to be explained to your Grandchild.

no more smog, we have smokeless fuel!

Pinny

Smog.

Smokeless coal for the fire

Sago, semolina pudding, tapioca

blancmange and jelly

Hospital screens on wheels

Half a stone of potatoes.

blancmange !!! My grand daughter could not get her head around this word,

I once had to explain to my grandson where the expression, "Spend a penny." came from. I later heard him telling his friend that, "In the olden days, ladies had to put a penny in the door to use the loo". I was amused by the "olden days".

Doodlebug, buzz-bomb, Blighty, district nurse.

We still have rag and bone men here, ringing their bell..
We used to have some coming round near us - no-one dared leave a bike on the front or anything like a lawnmower while they went for a cuppa because it would have gone!

We too have rag and bone men coming round occasionally. I do wonder where they're putting the stuff they collect but have no use for though. Do they fly tip it?

Air-raid shelter, ration book, tram ìnspector, test card

Prefabs.
Maybe it's time to re-introduce them to solve the housing shortage?

We still have rag and bone men here, ringing their bell..

So many! Where do we start? Scullery - where we kept the mangle! Coal scuttle - where we kept the coal! The coal men - deliverying the coal (very scary with their heavy boots and dirty clothes!). The 'rag & bone men' , who were basically recycling unwanted clothes etc. Nissen huts - I was convinced that there were very frightening men living inside - on our way to Sunday School! Wireless - a great form of informatation & entertainment prior to television. Chilblains? Do they still exist now we have central heating and tumble driers? Give me time, I'll think of more!

Addressing my parents as Mum and Dad and their friends as Mrs Brown or if they were really close as Aunty May etc.
Our grandchildren ( eldest 4 yrs) addresses her parents by their first names.
Not sure if it’s a good thing or not but supposedly very hip! Parents friends are addressed by there 1st names we are traditional Grandma and Pop!

We used to get 7lb catering bags of the stuff, it never seemed to run out!

I think my mother must have tried every brand of custard powder!
I remember them all

Brown and Polson Custard powder. My MIL worked in the food testing kitchen in Brown and Polson and my children were brought up on every flavour imaginable, as we got it for free.

And Monk and Glass custard powder:

Creamola custard powder- I haven't seen it in years.

Monk and Glass Custard Powder
which makes me think of:
Bob Monkhouse

Birds custard powder
Oh, is that old-fashioned?

Cycle clips
Cuban heels
Olive oil in tiny bottles from the chemist
Birds custard powder
Junket