Diferent passports?

I have emailed Virgin cust. service twice in the last week and no answer so maybe someone here knows...
I am on VS46 Nov 1st and flying with my 6 year old. I carry a UK passport and she has a US passport. When we arrive in LHR I know that UK holders go through 1 line and other nationals go through another line. Does anyone know if we can go through the same line since I'm not leaving a 6 y.o. to fend for herself? Last year my husband was with us and she went with him so I'm not sure what to do. Thanks!!
I am on VS46 Nov 1st and flying with my 6 year old. I carry a UK passport and she has a US passport. When we arrive in LHR I know that UK holders go through 1 line and other nationals go through another line. Does anyone know if we can go through the same line since I'm not leaving a 6 y.o. to fend for herself? Last year my husband was with us and she went with him so I'm not sure what to do. Thanks!!