If your website is designed in such a way that it makes an offer to the customer, and the customer accepts it, you may be contractually committed to supply at the advertised price. It has been known, for example, for companies to find themselves selling goods for £2.99 instead of £299 after a typing error. Similarly, if you agree to sell goods which you cannot supply, you may be contractually liable to the customer.
A safer solution is to ensure that your website only constitutes an 'invitation to treat' - ie an invitation for the customer to consider buying from you and to place their own 'offer'. If your website does contain incorrect information, you will then have the opportunity not to accept the customer's offer to buy.
