Apr.6 (GMM) Sir Frank Williams has backed formula one's expansion, but thinks Bernie Ecclestone should pay for the privilege of a longer calendar.



A raft of team bosses recently said they would agree to the F1 chief executive's desire for 20 races a season.



"We support twenty (races) providing Bernie recognises it costs a lot more because of extra people and transporting equipment," Williams said at Bahrain's Sakhir circuit; his first appearance at a grand prix in 2008.