If you have not been included in a will or you are concerned about limited provision, you should seek specialist advice as soon as possible.  A claim must be lodged with the court within 6 months of the grant of probate being issued.   You do not (and should not) wait for the grant of probate to lodge your claim and it is wise to advise the executors as early as possible about your potential claim.    The earlier that you can prepare your claim and notify the executors the better.