Hi there.
Definitely, as Mark pointed out, John had some kind of commercial success in Italy, although AFAIR he never entered the charts.
For reasons unknown, "Metamatic" was never released in Italy and therefore had limited availability as an import-only record, with the strange exception of "A New Kind of Man" that was used as the ending music for the "Sapphire & Steel" TV series and later released as a single.
"The Garden" and "The Golden Section" were published in Italy and during 1982/83 John enjoyed (!) his maximum exposure on Italian media: he was interviewed several times for music magazines, made at least one TV appearance, had his videos (notably "Dancing Like a Gun" and "Underpass") broadcast a few times.
I remember a rave review of "The Garden" where the reviewer praised John's return to a more organic sound after the "stark and ice-cold Metamatic"...
The collaboration with Antonioni didn't bear much fruit in commercial terms since the movie "Identificazione di una donna" wasn't very successful, to put it mildly.
In December 1983 John gave 4 concerts all over Italy (BTW I went to the Milan gig and managed to sneak backstage and meet him and Robin Simon ;-) and he was very well received, with venues almost full and audiences who knew his work both with Ultravox and as a solo artist.
Unfortunately "In mysterious ways" again wasn't published in Italy and John (almost) disappeared from the Italian music scene.
BTW I recently discovered that an Italian artist (Faust'O) released in 1980 a song titled "Hotel Plaza" that, although musically different, is a blatant rip-off of our beloved "Plaza".
Comments welcome:
Faust\'O - Hotel Plaza Ciao,
Luca