No, it is against the law to rip DVD you own to watch on electronic devices including an iPad. In 2011, the UK Government made it lawful for people to make copies for the personal use of their media, but that did not mean it was lawful for people to break the Digital Rights Management (DRM) technology that defends DVDs.
Since DVDs have digital protection, users do not get a DVD Import feature in iTunes together with the CD Import. Technically it is unlawful in the UK to copy any media, but the rule has never been used when it is a product you have and it is for your own personal use. Where the rule gets a little stricter is if you start selling, or sharing, copied files.