OK. I am very bad at coming up with gift ideas and now I left it a bit late.
I have to buy for:
Married couple in 40s without kids - living in the UK.
Married couple on 40s
All adults are quite nerdy maths/engineer/IT types so wondering about ideas along that topic. Alternatively, maybe a present relating to Switzerland?
Cannot be food items and must be small items that can fit into hand luggage.
Ideas?
An Amazon.co.ukgift card.
Make sure you get the UK one, others from US/DE/FR can’t be used there.
alternatively some gift credits for some cloud AI or cloud in general, speaking about IT nerds
Too bad the ‘anno domini’ (version: Erfindungen) is only in German…otherwise, highly recommendable! (and, btw, no chance people play it in 30 minutes…)
now, if you want it to be real swiss, can be related to chocolate, cheese, mountains, or trains… what about this? Switzerland | Dovetail Games Forums
that is as nerdy as it gets… 
but, nice nerdy I mean
The 2nd couple are German, so the game might work.
I gave a nerdy friend a Galton Board as a gift and he was overjoyed with it.
It’s basically a device that demonstrates how randomly falling ball bearings distribute themselves into a bell-shaped curve, illustrating the central limit theorem in action.
I hope you included some instructions: