FlyingBoat

is intended to be parsed as

except on a route notified for the purpose of this sub-paragraph or in an aerodrome traffic zone notified for the purpose of this sub-paragraph

Unless the route you are instructed to fly under SVFR is notified for the purposes of that sub-paragraph of Schedule 8 (as some entry/exit lanes elsewhere are), you need 10 km vis without an IMC rating.