I don't know if anyone is still interested in the location of the Brunswick Vaults after all these years, but I have a simple blog on lost pubs –
www.bygoneboozers.co.uk – and have been digging into this place for a possible future post.
It was at 15 Holyhead Road, currently the location of Dimensions. It is marked on the OS Town Plan of 1888 and I have a picture of it when a John Gregson was licensee around 1895. I will attempt to attach these images to the post.
Regards,
Stewart