First of all, apologies to all who may have tried to contact me. I have changed my e-mail address and did not inform this Forum. Mea Cumpa. It is now done.
Further to my earlier messages and requests, I have now found the missing link thanks to the diligent research of a long-lost (now found) cousin. I can therefore trace up from Copsi TUNSTALL (c 1032 in Normandy) to me, Martin Cuthbert TUNSTALL (b 1942). If anyone would like to add their tree(s), please contact me - I already have several families "marrying in".
I am currently interested in the ONIONS connection who were apparently bellow-makers from Wales and settled in Digbeth and Aston in the greater Birmingham area. The ONIONS and TUNSTALLs joined up when Elizabeth ONIONS (1852-1912) married Thomas Henry TUNSTALL (1834-1910). By this time they had moved up in the world as Eliza's cousin, Simon ONIONS, had become a wealthy Worcestershire businessman and his daughter married to become Lady Constance Hattie BARBER (née ONIONS) who was founder of the The Barber Institute of Fine Arts in Birmingham.