Not necessarily, it all depends on how much you spend, the potential adjustment on a set of coilovers is considerably more than the stock setup if you go for a better quality option. I would not spend £300 - 400 on a set of coilovers vs stock setup as that stands a very high risk of buying something that will rust very quickly and return a very harsh ride. however when you get upto £1500 mark you have variable damping and the ability to balance the car on each corner to get an equal distribution of weight, decent damping will give a great ride even on UK roads.
For what you are looking for KYB would be ideal, have used them for many years as OEM replacement items - most recently on my lads Mitsi colt and will be using them on a 1989 Toyota Camry shortly 👍