Out Of Stock Handling

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Is there a hook I can hang some code off for the Out Of Stock handling? At present the code simply displays some text (and incidentally says it's added the item to your basket which it hasn't - I may need to report that as a bug elsewhere). I've changed the text so that it reads 'Special Order - please contact us for details' but we'd like to additionally email Admin to prompt them to contact the buyer directly.

Any thoughts or do we have to hack the core files for this?