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If you have spotted an error, omission or problem on the site, it would be really helpful if you could let me know where it is and what it is. Please be kind – remember that everything is free for personal and educational use, and I am only human.

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It would be great to hear from you if you have found the site useful or you have some helpful suggestions.

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Hopeful businesses — I do not want to buy any products, follow leads or sell anything.