Nice to get a mention in the LibDems leaflet - must mean I'm worrying them. Of course they've just added 'Greens' to Labour under their "can't win here" list - but that's just normal negative campaigning tactics.
OK - in 'safe seats' in parliamentary elections like Wansbeck, the argument "can't win here" may be valid - at least until we get PR for Westminster (though the LibDems have messed up prospects of that) - but in small local elections like Morpeth North, where maybe at total of 2-2500 votes will be cast - anyone can win (if they get enough votes - I reckon you could win with around 700 votes).
And I'd have thought the argument "Vote LibDem to keep out the Tories" was a bit worn these days - though of course the parliamentary situation is totally different from the County Council.
So no! There's no need to vote tactically against a party - no need to settle for 'second best' - vote for the person you want to be your county councillor for the next four years.