Gulliver - is it an adjustable truss-rod? If so, I'm surprised, they're usually non-adjustable in a Lowden.
If it's not adjustable, you need to either:-
a) Take it to a reputable, Lowden-experienced luthier to have it sorted out (try contacting Seamus at Vintage Guitars in Norwich, he may be able to point you in the right direction), or
b) Contact the Georhe Lowden Guitar Co. and ask their advice.
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sj