According to the Hansard Report April 2004 (Hansard is the edited verbatim report of proceedings in UK parliament), the following illegal raptor persecution incidents were recorded in 1991:
Seafield Estate (Speyside) – 1 x buzzard killed by Chloralose.
Rosehaugh Estate (Black Isle, Ross-shire) – multiple buzzards killed by Mevinphos.
Dougarie Estate (Isle of Arran) – 1 x golden eagle killed by Chloralose.
This report was published in the days when the government publicised the names of the Estates where illegal raptor persecution incidents had been recorded. Shame they don’t do that anymore – you have to wonder why? The Hansard report documenting these and other persecution incidents, can be read here: http://hansard.millbanksystems.com/written_answers/1994/apr/28/bird-killing