Just to put the extract I scanned into context of the rest of the advert, you can see the rest of it here:
(It was too large to scan, so I've photographed it. It's not amazingly clear, but you can read most of the text...)
http://homepage.ntlworld.com/duncan....3/NTL_ad_1.JPG
http://homepage.ntlworld.com/duncan....3/NTL_ad_2.JPG
http://homepage.ntlworld.com/duncan....3/NTL_ad_3.JPG
http://homepage.ntlworld.com/duncan....3/NTL_ad_4.JPG