Go take a look at the Citizen eco drive range.
They all use a solar powered quartz movement that is pretty much worry free sand one of the most reliable options out there, and come in a wide range of styles within your budget. Pretty much my default recommendation for a simple, no non-serviceable watch on a budget.
Failing that you are looking at options like the Seiko ranges (again, they do a range of solar quartz movements that should fit your budget), and various Casio and Timex models.
As much or as little as you are comfortable with.
As you noted, to some spending £200 on a Seiko is an expensive watch compared to the £20 Casio they wore before, to others that same £200 watch doesn’t even rank as good enough to be a beater watch.
Neither answer is wrong, they just suit different people, different lifestyles and different budgets.
So spend as much or as little as you are willing and able to afford. I know I will never be able to justify Rolex money, but that hasn’t stopped me finding my ideal watches that do fit my budget and I enjoy wearing just the same.