By Jon Robinson Six of the UK’s biggest broadband providers, BT, EE, Plusnet, Talktalk, O2 and Virgin Media, failed to make mid-contract price increases clear to consumers, the advertising watchdog has ruled. The Advertising Standards Authority (ASA) said the companies misled consumers by placing important information about price rises separately to headline prices and in areas of less prominence on their websites. The ASA ruled the ads must not appear again and told all six providers to ensure they make sufficiently clear that their broadband contracts would be subject to mid-contract price i…