round                                    circuit         date       class a winner  class b winner     class c winner class d winner
0     1  snetterton motor racing circuit , norfolk     14 april            john love  alan hutcheson  none (no entries)    mike parkes
1     2             goodwood circuit , west sussex     23 april  christabel carlisle  alan hutcheson  none (no entries)    graham hill
2     3   aintree motor racing circuit , liverpool     28 april            john love  alan hutcheson        nicky byrne    graham hill
3     4     silverstone circuit , northamptonshire       12 may            john love    peter harper      innes ireland    graham hill
4     5                    crystal palace , london      11 june            john love    peter harper  none (no entries)  roy salvadori
5    nc             goodwood circuit , west sussex      11 june              unknown         unknown        nicky byrne   pj woodroffe
6    nc  snetterton motor racing circuit , norfolk      15 july           mick clare  alan hutcheson            unknown    graham hill
7     6   aintree motor racing circuit , liverpool      21 july            john love    peter harper        nicky byrne     jack sears
8     7                        brands hatch , kent     6 august            john love      peter jopp       david haynes    mike parkes
9     8                     oulton park , cheshire  1 september            john love    peter harper      chris mclaren    graham hill

Table as JSON:
{"round":{"0":"1","1":"2","2":"3","3":"4","4":"5","5":"nc","6":"nc","7":"6","8":"7","9":"8"},"circuit":{"0":"snetterton motor racing circuit , norfolk","1":"goodwood circuit , west sussex","2":"aintree motor racing circuit , liverpool","3":"silverstone circuit , northamptonshire","4":"crystal palace , london","5":"goodwood circuit , west sussex","6":"snetterton motor racing circuit , norfolk","7":"aintree motor racing circuit , liverpool","8":"brands hatch , kent","9":"oulton park , cheshire"},"date":{"0":"14 april","1":"23 april","2":"28 april","3":"12 may","4":"11 june","5":"11 june","6":"15 july","7":"21 july","8":"6 august","9":"1 september"},"class a winner":{"0":"john love","1":"christabel carlisle","2":"john love","3":"john love","4":"john love","5":"unknown","6":"mick clare","7":"john love","8":"john love","9":"john love"},"class b winner":{"0":"alan hutcheson","1":"alan hutcheson","2":"alan hutcheson","3":"peter harper","4":"peter harper","5":"unknown","6":"alan hutcheson","7":"peter harper","8":"peter jopp","9":"peter harper"},"class c winner":{"0":"none (no entries)","1":"none (no entries)","2":"nicky byrne","3":"innes ireland","4":"none (no entries)","5":"nicky byrne","6":"unknown","7":"nicky byrne","8":"david haynes","9":"chris mclaren"},"class d winner":{"0":"mike parkes","1":"graham hill","2":"graham hill","3":"graham hill","4":"roy salvadori","5":"pj woodroffe","6":"graham hill","7":"jack sears","8":"mike parkes","9":"graham hill"}}