[Sundae]

I've posted before about a restaurant called The Dolphin in Leyton, which was like a perfectly preserved 70's restaurant. I went there with a South African friend, so he didn't get my sheer joy (prawn cocktail! Mattheus Rose! sweet trolley!) but he certainly enjoyed the food.

If you can get patterned carpet, you're well in.
If not, make creamed mushrooms with special mushrooms. You'll see patterns everywhere.

ETA
My 70s menu:

Prawn cocktail
no need to use English prawns (ie shrimps) but use shredded lettuce and Marie Rose Sauce made from salad cream & ketchup decorated with cayenne pepper
OR
sliced melon decorated with cayenne pepper

Ideally roast
Ideally pork or beef. Yorkshires must always be served.
Also acceptable - chicken kiev, steak & kidney pie, chops
Please note the above are only acceptable if guests turn up unexpectedly. Roasts should always be available.

Sweets
As mentioned above.
Black Forest Gateau. Offer with cream. Because it's not sweet enough.
Sherry Trifle. Should have enough alcohol content to render the guest unfit to drive without recourse to any liquers.
Fruit Trifle - tinned fruit where the only identifiable items are grapes and cherries, and neither taste as such.

Served with - Matteus Rose, Hock or Blue Nun.