@sladesounds, I don't think you're far wrong about the date. Added scan of Music Master 'The Record Catalogue' Entry showing release date as September 1986.
My copy comes with an Island "25 years" inner sleeve that has a list of albums available now (including this album) and those available in Autumn 1986, which indicates that this album must have been issued prior to Sept (?)1986.
Looking around it seems Island started using barcodes early 1986 most probably with this re-issue series.
Discogs also has this album listed as a 1986 Europe release. The discogs entry refered to below has a different barcode #.
I have left this as UK for the time being but amended the date to 1986.
ILPM 9120 was also released with a plain sleeve ie not 25 year anniversary on the cover. The bar code on the rear of the plain sleeve is 5 014474 101205