Alastair Cook will try out a number of helmets in an attempt to comply with new safety regulations .
Alastair Cook faces a race against time to find one he feels comfortable with in time for Essex 's championship match at Sussex on Sunday .
Alastair Cook will try out a number of helmets in an attempt to comply with new safety regulations but faces a race against time to find one he feels comfortable with in time for Essex 's championship match at Sussex on Sunday .