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Remember to calculate the actual sidewall height, as daveyjp did, not just look at the percentage figure, because it depends on that and the tyre width equally, given the result is a multiplication of the two.
My former car, a mid 90s Micra, had 175/60 R13 tyres, so 'higher profile' and thus better on the suspension than the other OEM size Micras then had, 155/70 R13? Nope - the former's sidewall height was 105mm, the latter's was 108.5mm high.
In reality, there probably wasn't much of a difference, as the law in the UK states to be legal, any replacement must have a rolling diameter / circumference of OEM within a limit of +1.5 / -2% of the OEM (when the car was new) fitted.
As it was, this law meant, even if I wanted to, I couldn't fit the 'other' OEM tyre other trim levels of my car used, because it was outside of that limit, at least without having the speedo and odometer recalibrated, which probably would cost quite a bit.
On the other hand, my current 2005 Mazda3 was allowed to change from its OEM 205/55 R16 tyres (sidewall 112.75mm high) to 195/65 R15 (sidewall 126.75mm high), because that does fall within the legal limit without any recalibration needed, as was indicated in the car's handbook/door plate.
I'd already driven my then company's pool car, which was a hatch (lower trim) version of mine which did have those tyres and smaller wheels fitted, and I noticed that the ride quality was better but with negligible loss in handling ability (it may make more of a difference for cars that inherently don't have good handling characteristics).
When one of my 16in OEM alloys corroded and caused the tyre to leak, which was also near the time to change tyres anyway, I decided to swap all the tyres and alloys out for the smaller size, still retaining the OEM alloy type (just 15in versions).
Both the 205/55 R16 and 195/65 R15 tyres (about 25% and 35% cheaper respectively) are very common / popular sizes, and thus are cheap in comparison to, say, near ones like the 205/60 (123mm high sidewall) fitted to the latest version of the Mazda3.
The smaller alloys were then (2018) about 40% cheaper than the 16in equivalents, so the cost of replacing everything at the 15in size wasn't much more expensive than replacing 1 alloy at 16in, and having all new 205/55 R16 tyres, because the other size was.
Even so, the OP's 3 tyres aren't of the 'uncommon' type (quite the opposite for the 205/55 R16, the 205/60 [and another similar one, the 215/60] is slowly replacing it as the OEM of choice for new Focus / Golf sized cars of the lower to mid-trim levels, along with some 17in ones).
Best to stick with what the handbook / door panel plate says you can use, as my situation as needing to replace at least one alloy (the others were going the same way and thus made my decision even easier / cost-effective) is not that common.
It's always good to check out on tyre fitters' websites what tyre size combos are common ones, and thus cheaper (for the overall sidewall height) to buy. Sometimes though, some otherwise excellent cars come fitted with unusual OEM tyre sizes, which are more expensive to replace, and where there's not any 'more common' (and thus cheaper) alternatives without (or at all) changing the wheel size or a recalibration.
I'd rather buy an otherwise great car which has that 'flaw' than not, if nothing otherwise comes close.
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