Is it still possible to get an MR816CSX repaired by Steinberg?
A few years back I sent one to Steinberg in Hamburg and they repaired it and returned it within a few days.
Or is there someone in the U.K. that can do it?
There is still an option to have the unit repaired by our service center Audio Service directly. They can provide the details and the estimate of cost.
Audio Service is located in Hamburg, Germany though and due to the Brexit it may be more difficult and expensive to ship the device back and forth. If you are still interested, you can send an email to m a i l a t audio-service dot com.