I would like to start a business but if I do I might wait a couple of years until I've got some money built up first. Always fancied owning a convenience store / Premier shop type shop and they are usually gold mines if you have good passing footfall.
Wouldn't mind getting into a couple of BTL properties too as a future retirement plan.
BTL is at least a part-time endeavour (less hassle still if you stick with commercial property AFAIK), I think owning a shop like that would potentially be a more than a full-time job!
If you were originally looking for just 16 hours a week I'd suggest that trying to run a convenience store is a bad idea (obvs you can employ others too) but it's still likely something that will leave you with something to deal with most days.
You don't need to save to set up a business, you've got a guaranteed income so could easily get a small loan, for example, according to this article a used ice cream van costs £15,000:
How to start and run a Mobile Ice cream business The inside scoop About this type of business In the 1950’s there were about 20,000 ice cream van operators in Britain – now there is less than a qua
www.ncass.org.uk
You can ditch it at any time, park the van for 3 months without incurring rent/rates charges or just sell it etc.. That's just an example of a possible part-time business you're not locked into you might hate the idea of being an ice cream van driver or setting up a food truck selling tacos or whatever food you love.
Do you like photography, it doesn't take much to be able to competently take say family portraits, easy enough to set up a photography studio (can do this in a retail unit or just part-time in an outbuilding or garage conversion at home) and do baby photos, portraits it's not like you're running the local shop so you could just not book clients for say 3 months if you fancied another big trip/holiday too.
I'd echo the suggestions to travel too! You could go spend 6 months in Australia and New Zealand while the rest of us get nuked by Putin!
Essentially I don't think you need to get a random job and I don't think your business needs to be some 1st gen immigrant grind set type.
if you just want to work a little bit then running a part-time business or doing ad hoc gig economy work (uber driver) etc.. is an easy solution and you're still your own boss.
You could pivot into other areas if you wanted to build a business up a bit too - whether you're an ice cream van man, food truck guy or a photographer you can pivot into doing weddings or events and offer to supply additional things like the photobooths and silly costumes for drunk people, chocolate fountains, arcade machines, play for fun casino games etc..