State immunity — Attachment and execution — Jurisdictional immunity — Distinction between adjudicatory and enforcement jurisdiction — Jurisdiction founded upon foreign State's ownership of property within the territorial jurisdiction — Property used solely for consular purposes — Whether inability to attach such property to enforce judgment precludes exercise by court of its adjudicatory jurisdiction — State Immunity Act 1978, Section 13(6)(b) — Whether only operating after judgment given against foreign State — The law of Scotland