Get some PlusGas rather than WD40 as it's a superior penetrating oil.
Can you add some leverage to the spanner, i.e. a length of tubing like a scaffold pole? You'd be surprised how much difference that makes.
@andyp started
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Get some PlusGas rather than WD40 as it's a superior penetrating oil.
Can you add some leverage to the spanner, i.e. a length of tubing like a scaffold pole? You'd be surprised how much difference that makes.