As said before, a differing postcode, vehicle type, age, garaging situation, driving history, modification level, financial situation (financed vehicle) etc can have an effect on a premium so unless 2 people with all of the above matching one another, then i doubt you will ever find 2 premiums to be the same. so unless your willing to give all the above details and possibly more, then there is no point coming on and simply telling everyone how cheap your premium is when everyones circumstance is different.
I think telling people about your claims experience would be more handy, as at the end of the day you are paying a premium on the chance a claim arises, and how that is handled should be taken in to consideration.