Turn the situation round, how would one put troops on an island to disrupt/sabotage the defence Command and Control? It is a big coastline with plenty of inlets/creeks.
Hvals use of 'civilians' could also prove very difficult to deal with, would the RN be able to justify sinking bunch of trawlers especially if there were some cameras on hand? Indeed depending how spread out they were how would the RN deal with effectively intercepting them?