You make a valid point - WA don't have to make PS4 available to UK users. That is their right. However, I can't see how promoting it to us (email sales shots etc) whilst adding the disclaimer that they don't support any changes to it make it an attractive option. I fully appreciate that there will be people here who would help if you 'break' it, but that's not the way I buy things! Because this is expected of me when I do business, I expect the person who makes something / supplies a service to help put it right. I don't think I would last long if I provided a product or service and told the client to 'find a friend' to help you sort out the problem.
Anyway, all that said - I'm still looking forward to the future PS5 release.