listen very carefully, i shall say this only once

How many times do we listen to adverts on the radio that nearly always end with all the terms and conditions applying to the offer that has just been advertised.  An example might be
"Previously offered at a higher price; terms and conditions apply; item may not be returned; allow three weeks for delivery; postage and packing added to price; no responsibility for misleading details; purchasers must be over 18; only available online; not available outside the UK; your choice of colour may not be available."
That's great and at least you can't claim you weren't told. But it is always spoken at the speed of light. Try it yourself as quickly as you can with someone listening then ask them to repeat it. You could be forgiven for not hearing all the detail.  However, the advertiser is NOT going to forgive you because the terms and conditions were stated with the advert and, as I said, you can hardly claim that it wasn't included. I'd like to know what the Advertising Standards Agency would have to say about this if you were to be involved in a dispute.