[The_Kaner]

The 2019 Proceed GT Line (Ireland) uses the TPMS system. I'd find it strange that the 2021 (UK) version would not carry this over.
The TPMS info can be seen on the LCD screen (central screen in front of driver) on the 2019 version (Analogue speedo/tacho).
Use Button 1 (MODE) on the steering wheel to change/cycle through options.
Not sure if your model is the fully LCD drivers cockpit.

 

[The_Kaner]

Do you have Tpms valves that look like this?

Pressing the Mode Button until it shows the car/lane (drive), it displays the TPMS setting, but you need to travel a short distance until it works out the pressures.

 

[The_Kaner]

My rather dirty valves

other than the valve caps they look identical to mine. Perhaps the software on your 2021 model is different then?
I've asked your question on a FB page that I am a member of.

KIA ProCeed owners | Facebook

🤩🤩 just love this car 🤩🤩 。

www.facebook.com

Hopefully someone on there with a 2021 version can help.

 

[The_Kaner]

Doesn’t look as though I have TPMS valves.

No, it doesn't those just look like the regular butyl/rubber covered type.
The TPMS valve stems fitted to Kia (and Hyundai) generally look like this.

The whole sensor within the wheel like this.

Some may also look like this, but the valve stem on this doesn't look 100% the same as yours.
There seems to be so many variations in spec/kit supplied between models.