Found a simple solution to the computer desk problem.
Bought four adjustable legs (Olov from Ikea SEK75 à piece), that can be adjusted from 60 cms in heights to 90 cms in heights, and one table top (Linnmon from Ikea, SEK 79) at the size of 60 x 100 cms. All in white.
I didn’t have to move the printer into the kitchen. Its shelf goes in under the table.
I now have a table of the right size and heights, and hope that my neck-problem will disappear now that the screen is no longer too high up.
The old table has temporarily been moved to the bicycle shed awaiting if somebody wants it. Doubt that, but you never know.
Below the old computer table. The new table is approximately the heights of where the shelf for the keyboard is for the old table.
PS. The old desk above is now sold and collected and has got a new home.