Need to check this with Whitburn and Guinness at home but I think you may be right here.
The correspondence between the UK and US singles charts in the mid-eighties in particular was extremely close such that in 1985 our charts were basically the Billboard charts a month out of date.
For a first hand account of why this situation arose, see Morley's closing remarks in Ask: The Chatter Of Pop, if you can find it.
― Dingbod Kesterson, Friday, 11 January 2008 14:58 (eighteen years ago)