And before you close that all up... just check to see how much a replacement thermostatic cartridge is for that valve... and if you can even get one - especially in 5 years time! You might get a bit of a shock!
Edit: looking again... that’s just a diverter isn’t it! Where’s the valve?
Well spotted the valve is an electronic one just under the tap connector at the bottom left of the picture.
Yes I share your concerns but I bought a well known brand and hope for the best! Luckily it can all be accessed from the other side of the partition if worst comes to worst.