I've done a bit of research myself and have not managed to find any evidence of chart success outside the UK
I'm sure everyone's already aware of John's UK chart positions, but for the record this is what I have found:
Singles Underpass #31 (1980)
No-One Driving #32 (1980)
Burning Car #35 (1980)
Miles Away #51 (1980)
Europe (After The Rain) #40 (1981)
Endlessly #66 (1983)
Your Dress #61 (1983)
Stars On Fire #89 (1985)
Albums Metamatic #18 (1980)
The Garden #24 (1981)
The Golden Section #27 (1983)
In Mysterious Ways #85 (1985)
Cheers,
Mike