Yes, W800 has 360° crank. Your findings exactly same as mine.
Done a bit of research on the problem
@Zonie experienced -
@Melnic mentioned it as well - grease-filled relays. It is a thing, relays filled with milky white greasy stuff. Can lead to loss of function. Some people have had problems including no engine, no fuel pump, no lights. There are three or four relays, depends on model year - one general, one starter motor, one fuel pump.
Some people recommend replacing them
all right away. However, another bloke put up a video of taking the relays out, cleaning the muck, replacing them and marking on each what it does.
So I looked up relays. Hitchcocks has an improved one for about £8 each. Or can go to automotive suppliers to buy them a bit cheaper, for example:
https://uk.rs-online.com/web/p/auto...VrZxQBh2_Nwc0EAQYBSABEgKqNvD_BwE&gclsrc=aw.ds
But the question on the Unofficial RE Forum was, how many people have actually suffered a problem? Would be interesting to know . . .
Think when I have a spare half-morning I might just take a look and clean the relays. Having watched videos, at least I know where the little chaps reside.