Because any "offer" via the website is "unavailable" via "GSF" website, or whoever may be offering "gsf-car-parts/company) your services on your behalf. Which is very intersting as, even though "click and collect" payment is not made untill collected in person at which time, the "online offer" is NOT accepted as "part of your counter trading agreement" !!! Which is confusing, as the whole point of any trading offer is one of a "valid offer to treat" !! accepted by one's of the acceptance "by reward and/or consideration" by "THE OFFER" An offer is ‘an expression of willingness to contract on certain terms, made with the intention that it shall become binding as soon as it is accepted by the person to whom it is addressed.’