Yes. Entering your registration uses vehicle data to show tyre sizes that match your Citroen DS5, then you can choose a tyre and book fitting at a local UK garage.
Check the tyre sidewall for the size format (for example 225/45 R18) or look for the tyre label in the driver door shut. Enter that size in the manual search to see compatible options.
It is best practice to fit tyres in pairs on the same axle so handling and braking stay consistent, especially in wet UK conditions. You can buy a single tyre, but many drivers choose two or four for balanced performance.
In the UK, car tyres must have at least 1.6mm of tread across the central three quarters of the tyre, around the full circumference. If you are close to the limit, replacing before an MOT or before winter conditions is recommended.
Many Citroen DS5 models use TPMS. When you book fitting, the garage can usually refit existing sensors and may advise if a valve or sensor needs attention. After fitting, your car may require a reset or relearn depending on the system.