Please could I possibly have a private post xx
Could I please have some advice I’m in the middle of applying for my children’s passports but if you don’t have contact with grandparents how do you go about applying for passport without their details and birth certificates x thanks in advance x
Source

Are you not a British citizen because thats the only reason you would need grandparents details
I put not in contact with them and all went through ok x
You don’t need grandparents details