Looking for Sims of London

I have a WILLIAM SIMS marrying a SARAH MILLINGTON in 1780 ST Bololph Bishops Gate London.
I have found one son my gggg grandfather, THOMAS SIMS B1781 HAMPTON WICK MIDDLESEX.
I can find no other children that I can prove but I have found four children born in Bath Somerset to a William and Sarah Sims whom I believe could be connected.
The children are JOSEPH MILLINGTON SIMS B1787,WILLIAM EDMUND SIMS B1789.ANNA MARIA SIMS B1791 and MARY ANN SIMS B1794 all christened Bath Abbey
Does anyone have any information on either of these families or any other Sims family from similar area please ?