Any driving offence which results in a fine must be declared for 5 years (unless the insurance company only ask for a short period of history, but 5 is the norm)
After 5 years they have no right to the infomation, and if they ask for it you can refuse to provide that infomation.
This is the case for all offences (speeding & drink driving).
However, in the case of drink driving you cant have the endorsement removed from your licence for 11 years (but insurance companies cant act on it after 5 years as per the above).
Dave
p.s. the 5 years is counted from the conviction date, not the date the offence was committed.
p.p.s. it is 7 years and 10 years respectively if a prison sentence of up to 6 months or up to 30 months respectively is involved.
p.p.p.s. if the sentence is over 30 months, then you must always declare it if asked.