XJS locking wheel nut removing tool needed

[slogs2310]

Any body out there got a tool to remove locking wheel nuts on an 87 3.6. The nuts in question have 3 holes in the head of the nut and i'm led to believe these are standard Jag issue. Dont want to go down the road of smashing on an impact socket (standard tyre fitters practice i'm told) so only the correct tool will do. Dont you just love careless previous owners and punctures!!!!!!!!!!!!!

will be extremely grateful if anyone can help me out,
best regards,
Andy