Hello cornishdave,
if the cell with the Vlookup formula is a merged cell, then I'm afraid you're out of luck. Merged cells do not auto-adjust the row height at all. You'll need to manually adjust it.
If it's not a merged cell, then you can run a macro when the sheet is calculated to recalculate the row heights. A formula does not trigger a recalculation of row height when the result of the formula changes. But if the sheet is calculated, the row height can be checked.
Put this code into the sheet module and enable macros.
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