Mark hi,and welcome.
Just to clarify point 3, is it the control buttons that are the problem or the temp/time display ? the latter is a fairly common
problem on the Mk2 ,the only cure for that is an LCD replacment.
The steering tilt and slide is powered by two motors so unlikely both have failed ,common to both is the tilt and slide ECU with attendant wiring which could be the problem ,there is a fuse but this also protects other circuits which you don't mention as having problems. There is also a 30amp circuit breaker ,I had this fail on mine a couple of years ago with similar symptoms to you. The circuit breaker is located under the dash on the fuse panel ,if it is OC when checked with a multimeter you have found the culprit.
I took the thing apart cleaned it and reassembled which fortunately restored it to working order ,I meant to source a replacement
but completely forgot all about it until your post.
For the memory problem are you setting it as per the handbook and do you hear a beep when it sets.
Best of luck with your niggles.