Whitecloud who came to Britain in 1973 was Pedro Columbo, probably the wrestler who was on Bill's link. He tagged with Thundercloud.
There was an extensive run of Whitecloud matches again in 1978 and 1979 for independents. Whether this was the same wrestler I don't know, though the WrestlingData site does list Columbo working here as Whitecloud in 1980 and 1981, so it could be.
Apart from that there were other Whiteclouds on independent shows. In fact the earliest Whitecloud I found on the independents was in 1969, which pre-dates Columbo.
Thanks Bill, you tried, but the video is not available.
Was there a British wrestler who used that name?