Hi Tony,
I am sorry, i know that you are 100% convinced of what you say, but over the last few days i have been in touch with Trading standards, Citizens Advice and all over the web (nothing to do with Axminster i just want to know my rights), and no matter what PC World told you it is not the responsibility of the manufacturer after 28 days. In fact as far as you are concerned it is not the responsibility of the manufacturer at all. Your contract is with PC World and not HP. The contract with HP is between PC World and themselves. In law HP do not have to deal with you at all. Although i have found out that it would be very rare for them to refuse to help you even if only as a gesture of good will.
It seems that most of us are ill informed or we do not know our rights at all, and this includes a lot of staff that work for these companies.
Trev seems to know a lot about the law so just ask him, or go to a Citizens Advice or Trading Standards site and you can see for yourself. These sites are there to help us and they are not going to post the rules/regs if they are not true.
These companies try to feed us with a load of rubbish and most of us believe them. As has been mentioned before these companies tell you how long the warranty is for etc, etc, and usually in very small letters they quote the law (because they have to) "This does not affect you statutory Rights" and some of your statutory rights i have already told you.
I am glad that you got a new camera and i hope that you enjoy it for many moons to come.
All the best
Mike.C