I tried out that application mentioned above and it works well but as Kitz thought certain pages do not operate correctly i.e. the availability checker page.
All the HTML pages work fine though. When the files are downloaded it really does make you think how "big" the site is... I just tried it out on the ADSL section only, since it is the section I refer to the most and there are 101 pages!
Then again it is the leading site on the topic and reflects the hard work and dedication that has gone into building it up