“…hat the Patents Court has jurisdiction to make an Arrow declaration even though EP894 has proceeded to grant (cf. Mexichem UK Ltd v Honeywell International Inc [2020] EWCA Civ 473, [2020] RPC 11 at [31] (Floyd LJ, with whom Lewison LJ agreed)). This is for two reasons. First, although section 74(1) of the 1977 Act provides that the valid…”