O2 and Vodafone in 'best employer' top 20

O2 and Vodafone both feature in the 2008 Sunday Times "20 Best Big Companies to Work For" survey. O2 - at 6th place - is the highest-ranked telecommunications company, despite dropping from 5th place last year. Vodafone is also in the top 20, dropping two places from last year's number 15 to 17th place. However, neither company ranks in the overall top 100. Top big company was financial advisory group KPMG, while overall top employer was central heating company Heat.