but never mind, here's the answer to your question:
There's no 'official' regulating body for Dell, or for any other computer manufacturer - they are consumer electronics retailers, and are not like telecoms or insurance companies.
Like all retailers of goods and services, Dell is obliged to conform to the requirements of all current consumer-protection legislation. If you feel that the company has failed to do this in some way you can insist on compliance, but if you still get no satisfaction you'll need to take personal action - either through a small claims court procedure, or by asking your local Trading Standards office to intervene. Consumer direct is there to offer advice only, they will not take any action on your behalf.
We can also offer advice with specific problems, but you'll need to provide us with details.