I am surprised and somewhat puzzled that you do not consider Chambers to be the current UK number one sprinter. Let us compare the performance results of both Chambers and Williamson for 2008, up to the present date.
Chambers took part in nine 60m races, winning eight and, in the other gaining silver medal in the World Indoor Championships. His best three times were: 6.54, 6.55 and 6.56
Williamson took part in seventeen 60m races, winning only five. His best times were 6.57, 6.61 and 6.61
Chambers competed in eleven races over 100m, winning ten, including a memorable victory over Williamson in the Olympic Trials. His best three times were 10.00, 10.05, 10.06
Williamson took part in nine 100m races, winning only three. His best times were 10.03, 10.16, 10.27
Chambers took part in one 200m race, finishing second in 21.07.
Williamson took part in two 200m races, finishing fifth and sixth, in a windy 21.54 (+2.5) and 22.07
Powerof10 figures reveal that Chambers was not placed outside the top two in any competition. Williamson has placed outside the top two in eleven of his races to date.
I hope you will accept that my view that Chambers is clearly UK number one is not based solely on his defeat of Williamson in the trials.